Group Masters stuck at 100%

Some group masters are stuck at 100% during my last show. Front panels playback bar shows a blue column and it is not possible to grab this value with the master fader. Turning down the groups via group directory button + intensity encoder has no effect either. Deleting the groups from the masters and moving them back again, had no effect. Desktop restart did not helped, i had to log off and on again to get things going, which is magnificent right in the middle of a show.
Console: RoadHog4, Hog OS 3.12

BTW: Is that correct, that groups with a intensity below 100% do not have their percent values colored in red anymore in their group directory buttons, or is that a bug?