Plexus scene suddenly not working...

HELP! I built a rather complex Plexus scene yesterday. Now when I open the same AE file, the Plexus layers are blank. All the keyframes are there, but nothing renders. If I make a new layer within the same comp and add Plexus to that, it works fine. So the plugin is working. Just not on the layers I built up yesterday. ANY advice would be much appreciated. Deadlines loom!

Bingo.
I had moved the OBJ to another folder.

Thanks!