Frescobaldi 3.2 in Mint 21 LTS: garbled UI

[papioara]

Hello,
I just upgraded my Linux Mint from version 20.3 to 21. Now I have a serious problem with Frescobaldi 3.2: I can launch it, but the UI is garbled - see screenshot:

By 'garbled' I mean that the menus are only visible in part as well as tabs. Some like on the bottom left - Music View, Lilypond Log, Documentation etc. are still clickable, but invisible. When I launch Frescobaldi on the command line, there are no errors strangely, but it is all too obvious that there is something wrong.
What works for me as a workaround at the moment is the flatpak, which on launch throws a couple of errors, but otherwise just works.
I would greatly appreciate, if someone could explain what is the problem here and hopefully suggest a fix...
Thank you in advance!

[jeanas]

Did you install it from your distro or by hand?

[papioara]

Actually first manually downloading it from Github. And after having had those UI problems running it by doing

python3 frescobaldi

from inside its folder, I tried an install from the repos as well, but with the same result. qpageview is installed, of course. And on Linux Mint 20.3 the manually installed Frescobaldi just worked fine.

[papioara]

I have the impression that it has something to do with qt5. I have another package - tea editor - which also relies on qt5 for its interface which shows exactly the same symptoms.

[jeanas]

@papioara Are you using the Cinnamon, Mate or Xfce variant of Linux Mint?

[papioara]

Thank you for asking. I am on Cinnamon, but the problem is solved in the meantime. It occured in the aftermath of an upgrade from Mint 20 to 21. It has turned out that a couple of things under the hood of the system had been messed up. In the end I decided to do a fresh install of Mint 21, and although it was quite a bit of additional work, it has paid in the end. And Frescobaldi is also running fine now. So we can close this issue here.

[jeanas]

Thanks for confirming.