We were having problems where the uploader wouldn't do anything. I noticed that the Flash uploader for WordPress was also broken, so I searched on that.
Flash 10 causes the Flash uploader in WordPress to break, so you have to downgrade to Flash 9 or use an open source flash option, that I haven't looked into yet.
What I did:
- Downloaded Flash 9
- Downloaded Flash unistaller
- Ran uninstaller
- Reboot computer
- Installed flashplayer9r124_win.exe from the zip file above
The source sites I have listed info from are:
Hope that helps!