I need a workaround

I'm not sure what to do at this point. The main problem is copy /paste functions not working in musescore and I need to end my song, of which I need to unfold a repeat to attend to the changes over the final part. Considering rosegarden as best alternative, but it's very ugly for drumset editing as it doesn't display the correct note heads.

What I have in mind is to install another OS, since the problem relays on an incompatibity with latest arch linux version.