I'm running PM on Firefox 11 with Adobe Flash 11 and just a keyboard and a mouse; that should suffice.
However, you can try the zoom in/out option in Firefiox, that has been known to help. Just zoom in and out and see if that does the trick.
Furthermore you can try reinstalling Adobe, even if you have the latest version already; sometimes it just goes bad.
At all times make sure you only run PM in 1 browser window or errors will occur (really bad ones!) And don't run any other windows with sites that also use a lot of Flash programs, at the same time as PM.
Let us know how you get on!
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