Cant see youtube video's on forums

I recently added a AVAST system. I think this happened right after that. The problem is that if I am on a forum, (www.rcgroups.com for example), and there is a post with a youtube video, I used to be able to see it and click on it and watch it. Now, all I see is a blank box with a little square on the upper right hand side with a red square, green circle and blue diamond. If I click on the name of the video, it will go to youtube where I can watch it. Its not like it was before, why is this happening?? Thank you

By the way, I’ve already updated to the latest IE, erased, and redownloaded adobe flash, and shockwave players. Nothing is helping. Is this issue because of the avast antivirus???

It shouldn’t be due to avast… it shouldn’t have interfere with this…
Any other security program that could be messing it up?
Which is your browser and operational system?

Might be helpful if you could post a link to one of the posts with a youtube link, then someone with IE8 (?) could see if they experience the same problem.