That's great news - and quick too
Before I read that you had resolved it, I did a bunch of tests this morning. I thought I'd share them in case it changes the implementation of your fix:
My system (the one with 4 monitors described above) is a laptop attached to an HP dock via Thunderbolt (providing 3 monitors) plus an HDMI port connected to the 4th.
- The laptop by itself has no problems
- The laptop with the HDMI (i.e. one external monitor plus laptop) has no problems
- Plugging in the docking station with the laptop screen open has no problems. (3 external plus the laptop screen = 4)
- Closing the laptop causes the problem. Now all 4 monitors are external. The laptop screen is no longer on.
Hope that concurs with the fix you've made. Being a new customer, I'm not familiar with your process. How long do you generally take to release a fix like this?