Every time I go to watch a Youtube video in fullscreen I get that in the middle of it and it never disappears and neither does the cursor which normally does too. It was happening a while back then went OK again but now it's started again for no apparent reason. I have the latest version of Flash/Firefox and I've tried reinstalling flash and refreshing the page etc.
Any idea what's causing this? I quick Google search shows I'm far from the only one with the problem but no-one seems to have a solution.