Help with bug involving tremolo

I believe this was a new score in 1.1 - was fiddling around with tremolo and changing values of notes. I changed the first note to a value higher (according to a note I made), and it ended up before the time signature.

I think possibly when it was saved (?), it ended with the attached score (I can't confirm this, but I believe that's how it could be) - the time signature appears before the clefs and notes.

I don't know how to reproduce, but perhaps there maybe a clue.

Using MuseScore 1.1 - Mac 10.6.8.