Sorry for the delay in posting this. I DL'd and installed the latest RC4 a week ago on a PIII 500 and a PII 750 both with 256MB.
Installation: exception (similar to below) on exit from adding users.
Reboot:
VASM/Hardware config - cannot be used while x is running (that's also in 5.9)
VASM/Utilities
This application has raised an unexpected error and must abort.
[-1] Unable to load image
Mfiles.?.0
VASM/Service/Cups: unable to mount Epson Stylus C60 which 5.9 did
And, unlike 5.9, root CAN NOT have screen saver. I know! "You must be crazy!" I've known that for years

Also, after fighting it for 5 months in 5.9, I've decided that the only way I can share files among all my PC's is to keep a Win9x running! ( I may even have to move the printer to it!