take a look at this thread I started in teh Encore forum...http://forums.adobe.com/thread/889552?tstart=0
I at first thought the problem was simply Encore related but it appears to be an underlying production suite issue...and of course I'm on a deadline of tomorrow morning!!
Trying to transfer the project to a different machine which isn't showing these issues yet....any thoughts appreciated
The error log report for the failed MPEG-2 export noted in the thread above reported 'Unknown Error Encoding Failed"
More reading... Long File Names or odd characters cause problems
And #4 http://forums.adobe.com/thread/666558?tstart=0
And This Message Thread http://forums.adobe.com/thread/665641?tstart=0
Also, try the Run as Administrator option http://forums.adobe.com/thread/771202?tstart=0