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So yeah this boots and runs just fine on M1 Mac, BUT - I'm not able to save any files. The dialogue pops up, but it just won't save. Can you please double check this at your end Tom?

I don’t know about Mac, but on windows you have to type .wav at the end of the file name or it will not save.  For example explosion.wav  

If you just type explosion, it will not save.