The first M260 I had constantly lost its fixtures. Elation replaced it. The replacement is much more stable, but I never go to a gig without a lap top with which I can reload the fixtures - and I have to use occasionally.
I don't use the blackout button, so I can't help you fix it. Instead, I use button 23 on each page of Shows as my blackout setting, buttons 21 and 22 as super flashy light shows, and button 24 as a low lever, between song light scene. In this way when we play a song that has a big ending [drum rolls and guitars wailing]; I hit button 21 or 22 during the drum roll and 23 (blackout) at the smash end; and then after a few seconds bring the lights up a little bit for the between song situation.
As to "multiple scenes," why can't you just have dance floor fixtures and stage fixtures and set the fixtures to do what you want. You can have mover and wash fixtures in the same scene.