Windows Movie Maker Problem

Quick question; I'm having that same problem again where, unless I play the vid from the start each time, the audio/video go out of sync. I've cleared the temp files, it's a Winamp file, not an MP3, the bit-rate is 128 so I've done everything that was suggested last time to fix it.

Anyway. While I was browsing the Tools/Options/Advanced I saw something about picture duration and transition duration; what should I have that set to? The default is 5/1.25. Is this something I need to tweak as a lot of my clips are short or is that not connected at all (feel free to roll your eyes pityingly at the depth of my ignorance; I won't mind ::g::)

I have the vid settings to NTSC and 16:9,

Thanks in advance!

ETA Fixed! I'm an idiot. The music WAS an mp3 after all... I converted it, reimported it and although the bitrate isn't 128, it seems to be working fine.

Many thanks for all the help!