Can't get embedded YT videos to display/play
 

I'm using the latest version of Flash, running Vista on IE 8, and up until about Tuesday or so of this week I was able to post and view and play YouTube videos just fine. However, now when I'm on any site except YouTube itself where there is an embedded video, I cannot view or play them or anything as all there is is a huge blank spot with the "generic thumbnail icon" thing in the upper-left corner. Don't know if anyone else here is experiencing this or not, but if you have any suggestions how to resolve this they would be much appreciated.