I found a bug and fixed it. Chris reports that the revised MrEd.exe works on his machine, so maybe I fixed *the* bug. If anyone else has seen the 100%-of-CPU problem in Windows, please try http://www.cs.utah.edu/~mflatt/tmp/mred.zip (contains a replacement MrEd.exe) and let me know whether it works. The change is also exp-tagged in CVS. Thanks, Matthew