Yesterday I upgraded and had this problem so decided to do a clean install to see if it fixed it, turns out it hasnt.
I installed everything and then tried to upload pictures using both the flash uploader and the standard one and the standard one just seems to freeze where as the flash says they have uploaded but they dont as they dont go into the category etc.
Its on
yourdomain.com • Index page if ya wanna have a look, anyone got any ideas how to fix it?