All of a sudden, any attempt to play a Cineform Aspect encoded clip in either Premiere 2.0 or 3.x just jumps to the end, whether in the souce monitor or the timeline/program monitor. The original HDV/mpeg clips play fine in other projects. I'm guessing something changed outside of Premiere, since both versions exhibit the same behavior, but I don't have a clue where to begin looking.

Uninstall Aspect HD and then reinstall it. If that doesn't fix things, file a trouble ticket at www.cineform.com/support