Hm, I probably did. I decided to go to 9/8 and somehow created lots of trouble I’m fixing. Good learning experience though.
yes, it’s essentially an irregular measure. I think ideally I’d like a signpost to let me know that it’s irregular.
That would be helpful, and if you delete the signpost it inserts rests at the end to establish the proper length
Edit: Ugh, actually it’s really a mess. Here be dragons … but I was able to go back to a good auto backup copy. Bonus, I found another way to get rid of the irregular meter, which is to Shift-M with insert turned on this time, and enter the same time signature. This time it gives you the extra rest.