I have had that bug happen to me before. Since it's not Mame you're using, I'm not sure how to fix that. Is there a game list text file somewhere or some filter? You could try adjusting that.
For Mame, you have to hit refresh (F5) in the menu and wait for all the roms to be detected (and make SURE they are working offline). Then exit Mame (from the menu) and restart the program. The games SHOULD be back. It could be that they were just not loaded into memory.
I've heard of kaillera "forgetting" what roms you have after you start a game and then exit, which means you have to do the whole process over again. If it keeps doing it, it must be a bug in the compile and I would try to contact the one who compiled it to report the bug (though chances are they don't speak english, so it may be difficult).
Set your mojob mame color in display to match your stupid ass desktop color to avoid black screen in netplay, fukaz. t(';'t -TFR, AD 2-20-02