I actually don't know where to even add a signature, but being in the IT field i can give some suggestions and sorry if you have already tried these:
Close and reopen browser
Try different browser
Reboot computer
Check for java/flash updates
Check for browser updates
Check for system updates
It sounds almost like something is stuck in memory if i understand what you are saying. It's ridiculous how many times closing a program and reopening, or restarting it will fix an issue. Hope this helps.