I can confirm that this bug has been fixed in 0.17.54

TruePikachu wrote: Fri Apr 19, 2019 3:27 am Do you have a log file?

factorio-current.log attached, nothing in the logs received between factorio starting at 14.324 and switching away & back to the beach ball of death. 76.155 is when I performed the force quit to kill it off

MacOS 10.13.6

Steps to reproduce:
- Start Factorio in User A's account, alt-tab back into Finder
- Switch to User B's account (without logging out etc)
- Switch back into User A's account.
- Factorio has the beach ball of death (irrespective of whether happens if you're playing or just at the ...