Autoplay on silly BPM Acidised WAVs breaks everything (FIXED)

[Amether]

Autoplaying this wav firstly sounds very strange/slow and makes all playback slow down and sound like a DX7 'spaceship'. Playing the file without autoplay on is fine but obviously isn't after the file is autoplayed. Stopping playback and restarting does nothing, as does even restarting REAPER. CPU is about 50% and stays there even if I start a new project. Restarting reaper makes everything good again.

Its Acidised BPM is about 1200. This is obviously silly, but as I can't work out how I could have made that happen on purpose, it might be a bug caused by a bug... you know...