Maintenance for the week of October 27:
• PC/Mac: NA and EU megaservers for patch maintenance – October 27, 4:00AM EDT (8:00 UTC) - 10:00AM EDT (14:00 UTC)
• Xbox: NA and EU megaservers for maintenance – October 29, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
• PlayStation®: NA and EU megaservers for maintenance – October 29, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
From this morning's PTS Patch Notes
The issue many Mac users have been experiencing is specifically called out for a fix:

This is the first time I've seen the "Mac game client" specifically named in the patch notes. I plan to test this out on PTS, and encourage other Mac users will do the same. I'm cautiously optimistic.