> The datfile format doesn't play a role for the problem you have described.
> Well...I can't repeat the issue here in any case but using a rc dat shouldn't
> (or better: can't) be the reason for it.
>
> Roman Scherzer
> ClrMamePro
>
OK, I'm lost then.

The program does change the setting files when loading the program up (whether it writes to the 'Misc_BIOSSets' line or not, the files are still being changed on load). Just mentioning this because you said earlier that the settings files should not change when simply loading the datfile, but every time I load one, the associated setting file is changed.

Again, the problem has gone away for now.

Heh, I thought it would be an easy one, cause I could replicate it every time. But I can't seem to see any pattern to it anymore. It seems to just come up every now & again, then I can find the way to make it happen, then it goes away for a while. :(

If you can't see anything that could write something wrong to the setting file when loading the datfile, then I guess this one should just get added to the 'too hard' basket :)