Unable to upload lots to the gallery or library.

Since the recent update, I have been unable to upload any lots (no matter how busy or empty) to the gallery or library. Whenever I try, I get the following error message pop up:

"Server error. We could not process this Gallery request. Please try again later."

This has been happening for about a week (prior to posting this).

I am aware that other people have had the same issue and I have tried their fixes (e.g. empty the cache), yet they are not working.