[sciurius]

This is very puzzling...
Most likely someging went wrong while importing, causing some kind of corruption somewhere (pretty vague, yes I know ).
But I can import a new copy of the same file and that works. So let's consider this solved.

Note about the file dialog: When editing a song, in the Files tab, press the "image" icon.
I get some kind of file chooser.
   
However, whatever image I select, I always get an error similar to this.
   
When I select one of the tools at the left, and select a file, it works okay.

Is this how it should work?