I just read thissboultbee said:Flip4Mac has confirmed that there is a bug with their WMV player version 2.0 with QuickTime 7.0.4. Until Flip4Mac posts an update, you have to revert to version 1 (1.0.3 was the latest, I think) of their player or use QT 7.0.3.
http://www.flip4mac.com/fusetalk/forum/messageview.aspx?catid=29&threadid=822&enterthread=y
"Reports also surfaced Wednesday that Flip4Mac's application was unstable with the latest version of QuickTime, version 7.0.4. Crashes of QuickTime and Safari were reported on numerous Web sites. The company told users that it is working on a fix for the issue and hopes to have it released by Thursday.
Microsoft had not responded to a request for comment by press time."