Just recently it seems that my flash player have had some troubles to display flash videos (youtube/dailymotions and others like this). This issue was supposed to be fixed with Flash Player 10 beta if I remember correctly.
My flash player is currently at the lastest version available (10.0.45.2) I'm currently on Windows 7 x64.
I tried to uninstall it and reboot and reinstall it, didn't work.
Sometimes when it freeze and I reboot it "fixes" temporary the problem. The freeze problem is each and every browser. If one fails and freeze, every browsers using the plugin or ActiveX (Opera 10.5/Chrome 5/Safari 4/IE 8/FF 3.7 all installed) will freeze upon playing.
I'm quite out of inspirations for fixing this up now I dare say.