I've re-installed PBP3. Now with version 3.0.6.4. Re-installed MCSX to version 5.0.0.5. Both are the very latest as far as I can tell.

The program is still not working. MCSX stops and throws off the same error message as above. It sometimes works for a while, but then goes bad. A cut and paste operation is not tolerated at all.

Any ideas out there? At this point the bugginess makes it impossible to work with.