Just updated my Mac Rhino from 5.1 to 5.2 (haven’t used the Mac in awhile); updated the WIP as well, and now I see that my alias list has been reset to default in both… 
–Mitch
…so I updated both Rhinos on Mac to check, but my aliases survived.
OK, some local glitch on my end then… The other “local” glitch is I didn’t have a recent backup of the alias file… 
Just checking this morning on both Rhino & WIP from last week and my aliases are all there.