I can swap LUTs ("Looks" on the Creative tab) on average 2-3 times before some bug kicks in and my footage suddenly looks like a gremlin behind the scenes wanged the shadows up to 500%. Once this happens, there are two ways to fix it: 1) turn off Creative, 2) reset or delete Lumetri (you cannot copy paste or you'll bring whatever weird value is broken along for the ride) - which means you have to re-correct your footage. Sliding the "Intensity" slider to 0% does not help.
This happens with factory preset LUTs. It happens with custom loaded LUTs. It happens on Cuda-accelerated Mercury. It happens on CPU-only. Sometimes it's triggered by changes - any changes, no matter how small - in slider values within the Adjustments section. Sometimes it's caused by the simple act of changing LUTs. It happened on 12.0. It's happening on 12.1.
That's all I can think to troubleshoot right now. It's exhausting and, frankly, I have work to do.
Am I the only one having this issue? I can't see how that would be possible, yet I can't find any other mention of it.
RED editing mode
3840x 2160 timeline
23.976p
PP CC 2018 v12.1
W10 (latest)
GTX 980ti (Driver 397.93)
EDIT: Once the bug presents itself, the giant washout happens when doing ANYTHING on the Curves tab as well. Even going so far as adding a single point on the line causes the shadows to flip out.
EDIT EDIT: AND THE COLOR WHEELS TAB.