Thanks for all the replys.

I still haven't figured it out, but it seems to happen under 2 conditions:

1. Big, 100+ meg files (games, movies, etc.).
2. Limewire has to go through a file path to get to the file I want (haven't tried it in 2.8.5 yet, though), however, in this case, the cannot move message comes up immediately, before it has a chance to try to download.