I have tried adding code for GZIP & Browser Caching manually to the htaccess file & I still get the error:
" - Your server may not have the "deflate" module enabled (mod_deflate for Apache, ngx_http_gzip_module for NGINX)
- Another plugin may be interfering with the configuration"
I have contacted my hosting provider and they confirm that the above module is enabled.
I have the same plugins on other sites as are on this one, and do not have this problem with GZIP & browser caching.
I have enabled support access.
Thanks for the help!