MediaShout V4 crashes on MPEG-1 auto-advance

So, two weeks ago, I installed K-Lite Codec Pack as advised to help with DVD playback issues. (Meaning, they weren't playing at all.) Helped with DVDs. Turned out though, when you tried to play an MPEG-1 files, it would crash MediaShout. No big deal, just turn off K-Lite's MPEG-1 decoding. Problem solved.

Until today. Today, whenever we would set an MPEG-1 file to transition at the end of FG automatically into another MPEG-1 file, MS4 would crash. Without fail. So in the frantic minutes before service, I uninstalled K-Lite. Restarted MediaShout, played through a song, then it crashed. The problem doesn't occur when you hit the space bar to advance, only when MS4 auto-advances.

This isn't usually a huge deal, but we use auto-advances for introductory music and such. It's a pain to have to manually advance them in the rush before service time. Any suggestions?

Also, FYI, running Vista SP1 and MS4.