Thanks for the observation. I had a request yesterday for a short video I had done in Vegas 5 to be delivered as a wmv file.
It has very little narrative, but, after reading your post, I checked and the sync is off..... guess I'll have to deliver in another format and let the user convert.
Was going to render in Vegas 4 to see if that issue is there, but I guess I de-installed it.
In fact, I noticed recently that if I encode using the preset "as is", I won't get the problem but if I just change one of the parameters, even slightly, I get the issue... and it's only with the Media Player so RalphM, you may want to check in different players because your files are probably correct (?)...
I tried several settings with the MP too but no success...