I'm using WLMM version 2011, Build 15.4.3555.0308  in Windows 7, version 6.1 and all codecs and video card/drivers are up to date. I still have a nagging problem after creating a simple but lengthy (around 40mins long) slide show using regular jpg files and some mp3s sequenced back to back for the audio. The video plays fine when played in short sections within Windows Movie Maker. However, both in WLMM and on the exported mp4 file of the completed project, the audio and video starts getting out of sync as the video goes on- which is a problem since the timing is specific and needs to be very synchronized.  If I pause and resume playing the project within WMM, the video and audio sync up at the pause point but then slowly get out of sync again. In short, the sync is fine when previewed in short segments but played as a whole, gets off towards the end of every song.  So it seems fine when editing and replaying small bits of the project, but then the full video or project when played through does not match my edits. I thought that maybe it was just viewing them in WLMM, so I published the project and watched it in WLMP and as an mp4 in other media players and it was out of sync. I'm not even trying to do anything technically fancy with this video. I'm working with basic mp3 and jpg files. I can't imagine this is an uncommon problem. Any ideas or fixes out there in the community? I put a lot of blood sweat and tears into this project (a graduation gift/slideshow presentation) so I'm hoping to actually share the project without any awkward glitches. Any help and solutions would really be appreciated.

thanks,

a distraught dad