Just spent the weekend rewiring my control panel only to run smack dab into a software issue.
Maximus 2.10, when I force a rescan of the ROM folder I get a scripting error on the importing .XML list step. Asks if you want to continue running scripts. Yes causes it to hang, no causes it to crash.
Tried a fresh directory install and it does the same thing.
Went into the preferences.exe file and deleted every Mame game lists. That seemed to resolve the issue. Now if I can just get my videos playing again ...