But... when you upgrade MAME/MESS/UME from SVN fairly often, and the version number doesn't change (lately also when the output from -listfull doesn't change), all emulator caches must be cleared "manually"! And since QMC2 has no way to find out if software-lists changed, it's the same here. To do so, either use the -cc (cache clear) command line switch or "Tools" -> "Clean up" -> "Clear ALL emulator caches" from the menu (and reload the game/machine list afterwards).

When any caches are not up to date, everything can happen smile.

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]