Hmm. I don't have a mac machine so I can't bug test these things specifically without trying to hunt down a friend with a mac. I'll try to poll my discord server to see if anyone has any thoughts (I know there are some mac users).
1. Selecting a renderer should carry over across play throughs. I'm not sure why it is re-setting (it does not reset for me, but as I mentioned, I'm on a Windows machine.) D=
2. Can you save manually? Again, quick save works for me fine but I'm not on the same OS. If you can at least save manually then for now, that should help until I can look into what might be causing the Q.Save issue on mac.
~Esh