> Version 3.32c if I change any of the scanner settings under "You want to scan:"
> or "Check", they are lost (reverted) when I press Scan. The only way to change
> them seems to be to close the scanner and re-open it before pressing Scan.
>

No, they work fine. Bet you pressed fastscan.
"Fastscan" resets the options to the ones which were used in the last "Scan" since Fastscan only rescans the files which 'had issues' in a previous scan and so they need to be checked with the same options.

Roman Scherzer
ClrMamePro