When I try to upload media, the "An Error occurred in the upload. Please Try again later." message appears.
The media still uploads to my media library, but I cannot access it from a post (thus I cannot insert it into a post or use it as a featured image, etc).
I have been through the forums. I have been on the phone with my server changing files and whatnot.
I have uninstalled plugins and disabled them. Nothing has worked.
If I can go back and un-update to 3.5 I would.