In case a plug-in causes CopperPlug to crash on start-up there should be a modifier button you can hold while starting the program, so that plug-ins aren't loaded into the Player.
See my current problem with the Wavestation pulg-in here: viewtopic.php?f=14&t=218
I removed the Wavestation entry from the preferences file so that I can start CopperPlug again, but this is not something a "normal" user should have to do IMO...