Solo Function Problems

Hello.

Recently encountered this issue, and can’t figure out exactly when or why it started.
I use a lot of group tracks (drums, snare, OH, keys, etc), and when soloing a track bussed to the drum group, the group shows muted and obviously doesn’t pass signal.
When I solo the drum group, some elements that are bussed to it solo, while others don’t.

Cubase Pro 9.5.50 for reference

Hi,

Could you try in the Cubase Safe Start Mode [Disable preferences], please?