Okay, after some more thought and offline consultation, I've changed the way DrScheme works wrt to saving compiled .zo files. It now saves its compiled files in compiled/drscheme/ (and compiled/drscheme/errortrace), meaning that the files will be ignored when mzscheme runs. It also only looks in those directories when it is in compiled-file-generation mode.
Robby _________________________________________________ For list-related administrative tasks: http://list.cs.brown.edu/mailman/listinfo/plt-dev