This is really odd. I've created hundreds of mpegs (DVD, SVCD, VCD) using both TMPEGenc and Ulead Videostudio 7. This morning I try to play one of the mpegs and WMP only displays the video portion of the file with no audio. After trying several files I noticed that the files that were created with Videostudio are the files that aren't playing audio. Files created with TPMGenc work fine. I was even watching the file last night and they played fine then. I haven't installed any new software in over a week.

When I open the Ulead created Mpeg files in PowerDVD they play fine. Anyone have any clue as to what happened and how it can be fixed?