I haven't had that problem but have it in a similar form. It has to do with
the filters. If you go into the tools section click on options. You will find
three tabs- Click on Compatibility. Uncheck all the filters and it should
help. My problem is when i "publish" and export the final product it turns to
a black screen with no sound after one forth of the video is through. I hope
i was able to help.

Good Luck,
freddydarksage