Key stuck

Hello there, I searched this forum and googled for it already, but to no avail.

Since yesterday eveing I have the following problem: Flash player behaves like I'm constantly pushing the left-key from the curser key block. Restarting Firefox (1.5.0.12) doesn't work. neither does clearing the cache and re-downloading the flash. No matter which flash I load, it's alwas the same problem, the input defaulting to a constant left-movement.

I'd be glad if someone could help me with this problem.