I also received the message that said "This disc uses a newer version of AACS protection. Please let us know about it..."
I'm using v1.17.7 of makemkv, and the dump file was named MKB_v68_THE_CAMERAMAN_381E.tgz which makes me believe the AACS version is 68. Any ideas why I get this error? Do I need to worry about it?
Edit to Add: I enabled debug mode so that log files would be saved, restarted the program, and it read the disc fine. I don't understand it, but I'll take it.