Hi, so this is the error that I get when running my game on OSX...
mono(811,0xa36e8000) malloc: *** error for object 0x79e57384: incorrect
checksum for freed object - object was probably modified after being
*** set a breakpoint in malloc_error_break to debug
at <unknown> <0xffffffff>
If I remove any calls to Content.Load<Song>() and Content.Load<SoundEffect>() everything runs fine (but without sound obviously).
This exact issue has been raised on the MonoGame github page, but the discussion ended with no solution.