Before installing RC4 I removed all previous SlickEdit configuration (from ~/Library/Application Support/Slickedit)
Autosave now fails ... after I start editing a file Slick complains
"Autosave failed to save the file blah.h, do you want to disable autosave?"
After I click no or cancel, then Slick further complains:
Error code out of range: 0
Well, no, I don't want to disable it, I want it to work!
The problem is that config/autosave directory doesn't exist.
Once I manually create this directory, then autosave works without complaint.