PSB

That would appear to have fixed the problem, thank you. But I'm a bit confused what was happening. I had it set to use a different folder for cache files (on an external USB stick because the files are very confidential and I don't want traces left on the computer), and it was already empty because I have it set to delete all files on exit. Why were files in the unused default cache folder affecting it?

Wavepad is refusing to load any of my files. The first dialog box says "Error opening files". The second says "Wavepad could not open file xxxxxxxx for editing". The same happens loading via both Wavepad menu and W10 File Explorer. "Groove Music", the default Windows 10 utility will play them, as will "Windows Media Player". It seems to apply to all files, including a newly created one whilst it is still on my Olympus VN-733 recorder, before transferring to the computer. Even files previously edited with Wavepad now will not work. It's the same with mp3, wma, and wav files, I don't have any other types. Uploading the latest version hasn't fixed the problem. Thanks