I have not seen this problem with my setup. But then again I rarely render anything while working on it, as unrendered playback works fine for most of the work I do.
I was able to solve this issue two different ways. One was to use the menu and choose "render entire work area" and the other was to close down premiere and reopen it.
After trying every possible non-sense adjustment......here is what I have found...the piece I have been working on has several .avi pieces which were created in After effects CS4....anytime any of these pieces overlap another piece of video in another video track in Premiere CS4...they will not render so I re-rendered these same .avis to .mov's and all is well in my world .....this a standard SD 720X 480 29.97 project....go figure?
here is a link to the finished piece for anyone who is interested....and yes it was rendered with the media encoder in about 11 minutes
several .avi pieces
Would you please make two example AVI files available for download so that others can test overlapping them to determine if everyone experiences the same problem.
If you can reproduce the problem with two instances of one AVI file, then only one need be posted.