Roman I have done a bit further testing...
I took the new Beta III binaries you posted,
dropped them into a fresh official 4.015 download, over writing the existing files..
Configured everything from scratch.
All seems to be working great
Nothing to report
Rest well
NOTE:
Others testing Roman's latest beta should do the same (as above) dropping into an existing pre-configured CMP folder is not advised.
I'm sure feedback is welcomed, how's does it work for you ?
Oddi, yes the DAT we were looking at, has some missing <merge tags> which could prevent duplicate chds being created.
Not cmp related, hopefully a future MAME release has those omissions corrected.