> Get the latest Clrmame and turn off the version checking for CHDs. Then you won't see > the errors.
IMO, tools shouldn't unilaterally mark v4 CHDs as bad. I made the decision to just BAD_DUMP the CDs that lack sufficient data to upgrade properly to v5 to save the community time and bandwidth. Roman of course threw a spanner into those works and created a lot of confusion. I'd like to see CMP updated to not enforce the version check if MAME reports something as a BAD_DUMP and the hashes match.