Paste repeat bar sign causes crash

Just to ensure the problem is in no way related to other complexities in the multi-stave scores I've been working with, I created the attached single line from scratch. Score created with 5-line percussion part and default MuseScore settings otherwise. I input the snare drum part in bars 1-3 from my midi keyboard, added the bass drum with mouse and cursor (MuseScore won't let me add 2nd or further voices from my keyboard, but that's a separate problem). I copy-and-pasted the notes in bars 8 and 9, then draged and dropped the repeat bar sign individually into bars 4-7. Finally, selected bars 2-8 and attempted to paste them starting in bar 10. CRASH! Error message "This application has requested the Runtime to terminate in an unusual way. Please contact the application's support team..."

There's more.
a) the automatically recovered version of the file is attached as Crash Sample 2. You'll see it dates back quite a way before the action that caused the crash (I don't know is that is of significance - guess it depends on the timing of the autosave).
b) the crash has other consequences. Last time it occurred I had several MuseScore files open, and the recovered session had renamed each file with the name of its successor. Phew! I recognized what had happened before everything went pear-shaped!

I look forward to hearing how you get on.
Frank