Hello, I'm having the same issue. I bought Switch, converted a handful of FLAC albums to MP3 successfully, and suddenly every FLAC file throws an error when I try to convert. "Converting Audio File: Unable to open file of type '.flac' is what it says in a popup when it fails. This is on a Mac, and looking for Switch-related logs in Console when I get that popup, I see the error "ExtAudioFile.cpp:192:Open: about to throw <private>: open audio file" but that's it. The files do open and play successfully, within Switch and without. Switch can play them and read the tags just fine. I also get the same error when trying to convert known-good files again, the same originals that I successfully converted just minutes before, when it was still working. I've tried restarting, and re-installing, with no change. This is a huge bummer because it was working so well!! Right up until it stopped working. But I was only able to convert 11 albums worth, and I have hundreds I was planning to convert with this..! Perhaps I didn't uninstall it properly, is there more to it than dragging Switch.app to the trash? Because on a reinstall it seemed to know it was registered still. Please help, I was so happy with this when it was working well!