I'm noticing the same thing every time I try to put my Fedora 8 VM into fullscreen mode. The system monitor suddenly jumps up to 100% and stays there, rendering my VM unusable. If I put the VM in single window mode, then it's fine, but this is annoying since there still is no dynamic screen resolution in Fedora (hint, hint).
Configuration:
Parallels 3.0 build 5584
MacBook Pro Core Duo 2.16 GHz 2 GB RAM
Mac OS X 10.4.11
Last edited: Apr 29, 2008