Constantly getting dropped frames message in Matrox Sequence.
Even after rendering workspace I keep getting dropped frames. Have to keep rendering over and over.
Also if I double click on an audio file the whole program locks up.
I haven't used Matrox but I have had a problem like this with premiere pro. The problem was that the part that wasn't rendering was outside of my workspace. I just expanded the workspace and I was ready to render.
It was an easy fix and hopefully your's will be as well.