most of the really bad issues were things that were broken in OS7 running VM too - mostly it was people messing with the upper 8 bits of pointers directly rathy

most of the really bad issues were things that were broken in OS7 running VM too - mostly it was people messing with the upper 8 bits of pointers directly rathyer than using the standard handle APIs, but expecting to be able to write directly to hardware devices or 'knowing' about undocumented stuff inside the ROMs was also an issue