> Fastscan is not working. Error says do a Scan operation first, even when I have
> already done one. Anyone else having the same problem?


Works fine here. Someone (maybe you) reported that behaviour with Logiqx's mame 93 changes datfile...and ONLY with that datfile.
Fastscan first looks if the crc32 of the datfile matches the one in the fastscan file (cmpro fastscanfolder), if they don't match or the file doesn't exist, it will request a scan.

So...clean your cache, be sure you got writing-rights on the cmpro fastscanfolder (and enough free diskspace). Maybe removing the .fsc files there helps you too.

I scanned several dozens dats with 3.63...fastscan always worked.

Roman Scherzer
ClrMamePro