@TGRSM
Just checking you are aware a pre-built of Qt 5.15.x (3?) is available via apt-get for Ubuntu 22.04?

@jazzco2 Right, but what's the solution? If an older windows dll fixes things, I could try finding and swapping it

P.S. that thread talks about a different issue. It is a crash not a warning with strange behaviour and there is no solution there either

@Joel-Bodenmann said in QStandardItem custom drag MIME:

However, I'd like to understand why QStandardItem does not offer a setMimeData() function.

Because noone wants to create a mime data just on suspicion for every item.

@nekkceb Further debugging FINALLY found the absurdly simple problem: I did not have the qtaudio_windows.dll files in my plugins/audio folder! That's it! Finally discovered single-stepping into

void QFactoryLoader::update()