Playback recorded Connect session exceeds screen parameters

We've never seen this problem before but when we playback our recorded Connect events the videos exceed the margins of the Internet Explorer window. I'm using IE7 and tested it in Firefox which has the same problem but then crashes before you can playback the video. I have clients complaining that they cannont see the entire window. We advised them to resize the left or right margins, but that makes the video smaller and sometimes unviewable. So the question is...during playback, the screen is supposed to fit without having to adjust the size of the window....right? At least that's what it did before.