Pickup Measure Bug
When I write a 4/4 piece with a 5/4 pickup measure it gives me a 6/4 measure. That much I know how to fix (highlight measure, click delete...not even sure if that itself is a bug). When I do that however, the next measure becomes a single quarter rest. I have to delete that measure in order to continue writing normally.
And also, It would be helpful if you could do partial beats in pickup measures, say a 4.5/4 pickup in a 4/4 measure (if I had a single eight note pickup) instead of doing a 5/4 and resting an eigth rest.