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It's happened to me twice now, and it's really ****ing annoying, loosing days of work.
It happens when first my music player crashes, I get stuttering sound, then when I pause the sound... it gets lowerer and more of a buzz. Then everything locks up.
I reboot.
Reload Hammer.. map is gone. There is no way of saving it, the vmf is wiped, the .vmx is corrupted.. unexpected end of file... even if you text edit it.