Hello,
I have some troubles with dat files
They produce for a large number of them the following messages in the scan results : wrong crc32 xxxxxxxx.xxx [wrong: 00000000] [right: xxxxxxxx] (xxxxxxxx is the correct crc, but 00000000 is what i have for all files)
The problem is that ClrMamePro seems to 'see' wrong crcs (all zeros) when the files are the right ones.

i have the problem with MameUI32 (http://mameui.classicgaming.gamespy.com/) snapshots as well as all extras files from MameXT32 (http://www.mamext.net/).
i have not tested other dat files yet.
the dat files i tried are those for Mame 0.125.

the problem was not present with older ClrMamePro versions.

i use CrlMamePro 3.114

Maybe a side effect, since some recent versions of ClrMamePro, i have had some extra directories created in the mame roms directory (like E:\Mame\Roms\Roms : the second Roms directory should have never been created by ClrMamePro).
it happens when doing a drag'n drop of the new files in the scan results window (like the directory containing all beta roms files, when a stable release of mame become available).
i can't remember if it happens under other circumstances, it seems that it is the only case (maybe because of the chd directory i have along with the roms one ?).