@whoopsydoodle said in Mono to Stereo in 2025:
Is there some other aspect that could be stopping it from being allowed on a mono track?
Well I think there must be...
But I don't know what it is. I think you'll need to start with the test project and build it out until it doesn't work. Or try and figure out what is different between your project and the test project - start with project preferences and make sure they are identical.