Media gallery thumbnails stopped working in multisite

After upgrading a multisite install from 3.4 to 3.5, thumbnails are no longer being generated when I upload an image into the media gallery. I suspect a directory permissions issue, or some disconnect with my site settings (upload path, etc). Can you help?

  • Mere Agency

    The original uploaded image shows up fine and can be used around the site, but thumbnails are not generated.

    Relevant plugins:
    - A3 Dynamic Gallery Plugin from A3rev.com
    - Better WP Security
    - W3 Total Cache
    - Sucuri Security

    The contents of .htaccess follows:

    `
    RewriteEngine On
    RewriteBase /
    RewriteRule ^index\.php$ - [L]

    # uploaded files
    RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

    # add a trailing slash to /wp-admin
    RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

    RewriteCond %{REQUEST_FILENAME} -f [OR]
    RewriteCond %{REQUEST_FILENAME} -d
    RewriteRule ^ - [L]
    RewriteRule ^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*) $1 [L]
    RewriteRule ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]
    RewriteRule . index.php [L]
    # BEGIN W3TC Browser Cache
    <IfModule mod_mime.c>
    AddType text/css .css
    AddType text/x-component .htc
    AddType application/x-javascript .js
    AddType application/javascript .js2
    AddType text/javascript .js3
    AddType text/x-js .js4
    AddType text/html .html .htm
    AddType text/richtext .rtf .rtx
    AddType image/svg+xml .svg .svgz
    AddType text/plain .txt
    AddType text/xsd .xsd
    AddType text/xsl .xsl
    AddType text/xml .xml
    AddType video/asf .asf .asx .wax .wmv .wmx
    AddType video/avi .avi
    AddType image/bmp .bmp
    AddType application/java .class
    AddType video/divx .divx
    AddType application/msword .doc .docx
    AddType application/vnd.ms-fontobject .eot
    AddType application/x-msdownload .exe
    AddType image/gif .gif
    AddType application/x-gzip .gz .gzip
    AddType image/x-icon .ico
    AddType image/jpeg .jpg .jpeg .jpe
    AddType application/json .json
    AddType application/vnd.ms-access .mdb
    AddType audio/midi .mid .midi
    AddType video/quicktime .mov .qt
    AddType audio/mpeg .mp3 .m4a
    AddType video/mp4 .mp4 .m4v
    AddType video/mpeg .mpeg .mpg .mpe
    AddType application/vnd.ms-project .mpp
    AddType application/x-font-otf .otf
    AddType application/vnd.oasis.opendocument.database .odb
    AddType application/vnd.oasis.opendocument.chart .odc
    AddType application/vnd.oasis.opendocument.formula .odf
    AddType application/vnd.oasis.opendocument.graphics .odg
    AddType application/vnd.oasis.opendocument.presentation .odp
    AddType application/vnd.oasis.opendocument.spreadsheet .ods
    AddType application/vnd.oasis.opendocument.text .odt
    AddType audio/ogg .ogg
    AddType application/pdf .pdf
    AddType image/png .png
    AddType application/vnd.ms-powerpoint .pot .pps .ppt .pptx
    AddType audio/x-realaudio .ra .ram
    AddType application/x-shockwave-flash .swf
    AddType application/x-tar .tar
    AddType image/tiff .tif .tiff
    AddType application/x-font-ttf .ttf .ttc
    AddType audio/wav .wav
    AddType audio/wma .wma
    AddType application/vnd.ms-write .wri
    AddType application/vnd.ms-excel .xla .xls .xlsx .xlt .xlw
    AddType application/zip .zip
    </IfModule>
    <IfModule mod_expires.c>
    ExpiresActive On
    ExpiresByType text/css A31536000
    ExpiresByType text/x-component A31536000
    ExpiresByType application/x-javascript A31536000
    ExpiresByType application/javascript A31536000
    ExpiresByType text/javascript A31536000
    ExpiresByType text/x-js A31536000
    ExpiresByType text/html A3600
    ExpiresByType text/richtext A3600
    ExpiresByType image/svg+xml A3600
    ExpiresByType text/plain A3600
    ExpiresByType text/xsd A3600
    ExpiresByType text/xsl A3600
    ExpiresByType text/xml A3600
    ExpiresByType video/asf A31536000
    ExpiresByType video/avi A31536000
    ExpiresByType image/bmp A31536000
    ExpiresByType application/java A31536000
    ExpiresByType video/divx A31536000
    ExpiresByType application/msword A31536000
    ExpiresByType application/vnd.ms-fontobject A31536000
    ExpiresByType application/x-msdownload A31536000
    ExpiresByType image/gif A31536000
    ExpiresByType application/x-gzip A31536000
    ExpiresByType image/x-icon A31536000
    ExpiresByType image/jpeg A31536000
    ExpiresByType application/json A31536000
    ExpiresByType application/vnd.ms-access A31536000
    ExpiresByType audio/midi A31536000
    ExpiresByType video/quicktime A31536000
    ExpiresByType audio/mpeg A31536000
    ExpiresByType video/mp4 A31536000
    ExpiresByType video/mpeg A31536000
    ExpiresByType application/vnd.ms-project A31536000
    ExpiresByType application/x-font-otf A31536000
    ExpiresByType application/vnd.oasis.opendocument.database A31536000
    ExpiresByType application/vnd.oasis.opendocument.chart A31536000
    ExpiresByType application/vnd.oasis.opendocument.formula A31536000
    ExpiresByType application/vnd.oasis.opendocument.graphics A31536000
    ExpiresByType application/vnd.oasis.opendocument.presentation A31536000
    ExpiresByType application/vnd.oasis.opendocument.spreadsheet A31536000
    ExpiresByType application/vnd.oasis.opendocument.text A31536000
    ExpiresByType audio/ogg A31536000
    ExpiresByType application/pdf A31536000
    ExpiresByType image/png A31536000
    ExpiresByType application/vnd.ms-powerpoint A31536000
    ExpiresByType audio/x-realaudio A31536000
    ExpiresByType image/svg+xml A31536000
    ExpiresByType application/x-shockwave-flash A31536000
    ExpiresByType application/x-tar A31536000
    ExpiresByType image/tiff A31536000
    ExpiresByType application/x-font-ttf A31536000
    ExpiresByType audio/wav A31536000
    ExpiresByType audio/wma A31536000
    ExpiresByType application/vnd.ms-write A31536000
    ExpiresByType application/vnd.ms-excel A31536000
    ExpiresByType application/zip A31536000
    </IfModule>
    <IfModule mod_deflate.c>
    <IfModule mod_headers.c>
    Header append Vary User-Agent env=!dont-vary
    </IfModule>
    AddOutputFilterByType DEFLATE text/css text/x-component application/x-javascript application/javascript text/javascript text/x-js text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon application/json
    <IfModule mod_mime.c>
    # DEFLATE by extension
    AddOutputFilter DEFLATE js css htm html xml
    </IfModule>
    </IfModule>
    <FilesMatch "\.(css|htc|js|js2|js3|js4|CSS|HTC|JS|JS2|JS3|JS4)$">
    FileETag MTime Size
    <IfModule mod_headers.c>
    Header set Pragma "public"
    Header append Cache-Control "public"
    Header unset Set-Cookie
    Header set X-Powered-By "W3 Total Cache/0.9.2.9"
    </IfModule>
    </FilesMatch>
    <FilesMatch "\.(html|htm|rtf|rtx|svg|svgz|txt|xsd|xsl|xml|HTML|HTM|RTF|RTX|SVG|SVGZ|TXT|XSD|XSL|XML)$">
    FileETag MTime Size
    <IfModule mod_headers.c>
    Header set Pragma "public"
    Header append Cache-Control "public"
    Header set X-Powered-By "W3 Total Cache/0.9.2.9"
    </IfModule>
    </FilesMatch>
    <FilesMatch "\.(asf|asx|wax|wmv|wmx|avi|bmp|class|divx|doc|docx|eot|exe|gif|gz|gzip|ico|jpg|jpeg|jpe|json|mdb|mid|midi|mov|qt|mp3|m4a|mp4|m4v|mpeg|mpg|mpe|mpp|otf|odb|odc|odf|odg|odp|ods|odt|ogg|pdf|png|pot|pps|ppt|pptx|ra|ram|svg|svgz|swf|tar|tif|tiff|ttf|ttc|wav|wma|wri|xla|xls|xlsx|xlt|xlw|zip|ASF|ASX|WAX|WMV|WMX|AVI|BMP|CLASS|DIVX|DOC|DOCX|EOT|EXE|GIF|GZ|GZIP|ICO|JPG|JPEG|JPE|JSON|MDB|MID|MIDI|MOV|QT|MP3|M4A|MP4|M4V|MPEG|MPG|MPE|MPP|OTF|ODB|ODC|ODF|ODG|ODP|ODS|ODT|OGG|PDF|PNG|POT|PPS|PPT|PPTX|RA|RAM|SVG|SVGZ|SWF|TAR|TIF|TIFF|TTF|TTC|WAV|WMA|WRI|XLA|XLS|XLSX|XLT|XLW|ZIP)$">
    FileETag MTime Size
    <IfModule mod_headers.c>
    Header set Pragma "public"
    Header append Cache-Control "public"
    Header unset Set-Cookie
    Header set X-Powered-By "W3 Total Cache/0.9.2.9"
    </IfModule>
    </FilesMatch>
    # END W3TC Browser Cache
    # BEGIN W3TC New Relic core
    php_value newrelic.appname 'PHP Application'
    # END W3TC New Relic core
    # BEGIN W3TC Skip 404 error handling by WordPress for static files
    <IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} !(robots\.txt|sitemap(_index)?\.xml(\.gz)?|[a-z0-9_\-]+-sitemap([0-9]+)?\.xml(\.gz)?)
    RewriteCond %{REQUEST_FILENAME} \.(css|htc|js|js2|js3|js4|html|htm|rtf|rtx|svg|svgz|txt|xsd|xsl|xml|asf|asx|wax|wmv|wmx|avi|bmp|class|divx|doc|docx|eot|exe|gif|gz|gzip|ico|jpg|jpeg|jpe|json|mdb|mid|midi|mov|qt|mp3|m4a|mp4|m4v|mpeg|mpg|mpe|mpp|otf|odb|odc|odf|odg|odp|ods|odt|ogg|pdf|png|pot|pps|ppt|pptx|ra|ram|svg|svgz|swf|tar|tif|tiff|ttf|ttc|wav|wma|wri|xla|xls|xlsx|xlt|xlw|zip)$ [NC]
    RewriteRule .* - [L]
    </IfModule>
    # END W3TC Skip 404 error handling by WordPress for static files

    # BEGIN W3TC Minify cache
    <IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteRule ^[_0-9a-zA-Z-]+/wp-content/cache/minify/[0-9]+/w3tc_rewrite_test$ /wp-content/plugins/w3-total-cache/pub/minify.php?w3tc_rewrite_test=1 [L]
    </IfModule>
    # END W3TC Minify cache

  • Jack Kitterhing

    Hi there @matt_heerema

    I hope you are well today.

    Thank you for the additional information, could you disable the relevant plugins and then upload a image and see if the thumbnail is generated, quite often this issue can be a misconfiguration with either Better WP security or the W3 Total Cache.

    It's worth noting as well that once the plugins have been disabled, can you check your .htaccess before testing and make sure all the extra rules added aren't there anymore, if they are, can you put it back to the normal .htaccess you would had, when multisite was first installed please?

    Thank you for being a WPMU DEV member!

    Kind Regards
    Jack.

  • Jack Kitterhing

    Hi there @matt_heerema

    I hope you are well today, sorry for the delay.

    Yes please if you could send the following information.

    - Mark to my attention
    - Link back to this thread
    - Include admin/network access
    - Include FTP
    - Include any relevant URLS for your site
    https://premium.wpmudev.org/contact/

    Thank you for being a WPMU DEV member and sorry again about the delay.

    Kind Regards
    Jack.

  • Jack Kitterhing

    Hi there @matt_heerema

    I hope you are well today, sorry for the delay on this.

    With my colleague @PC we have been doing further testing tonight on your install, and I'm afraid there is 100% a problem somewhere, thumbnails are not be generated and this isn't a .htaccess issue (confirmed), a permissions issue (confirmed) a plugin issue (confirmed). Now we have brought the list of possibilities down :slight_smile:

    Have you modified any core code of WordPress at all?

    Thank you for being a WPMU DEV member!

    Kind Regards
    Jack.

  • Jack Kitterhing

    Hi there Matt @matt_heerema

    Thank you for confirming that, there was some major changes in the handling of media with the update from 3.4 to 3.5.

    Now the next step would be to downgrade versions to see if the media does indeed still work, but the problem with this is, you can't use a 3.5 database with 3.4 core files.

    Would it be possible for you to create a exact replica of the site? Database and everything, if you could export a copy and then make a replica, would that be possible?

    Thank you!

    Kind Regards
    Jack.

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