Program crashes when changing note visibility

About four times within a few minutes, MS4 (.1) has crashed at the moment when I change a note's visibility. It doesn't always happen, but it seems to happen more when I have selected multiple notes across different time signatures. When I restore the session, the notes I added after the time signature change were not saved, which leads me to believe they're related.
(Edit: it has happened more without the time signature thing, so nevermind)