After appling some plugins I am unable to upload media

Hi, I am still new to WP, I have applied a number of your plugins to a test site. I have noticed that I am now unable to upload images (thumbnails are broken on file upload and on browsing the generated link a 404 error is displayed)

I have opened support access to the site. I am trying to upload the logo in png format. I have even removed the image compression plugin and set file permissions to 755 to no avail. I do not have the same issue on a other site hosted on the same provider (no womudev plugins for now)