The only issue I'm aware of is with the menu display on Superbit discs with minimalist menus: those that have a vertical stack of buttons against the brushed-steel background. I think those are the titles with plain red disc art.
For those discs the menu displays briefly then goes black with a red selection rectangle. You can fix it with STOP + PLAY.
Some Superbits have more traditional menus that do not have the problem.
This bug was introduced in recent firmware and I suspect it will be fixed shortly.