Hi,
Played around with 5.10 a bit, setting up a Mimocall to do some testing.
When I added the face tracking effect, I noticed the image got brighter. Seems to be a gamma shift.
Other effects did the same.
Also, when the effect is added in the source window, the window doesn’t expand enough for the bottom settings/controls to remain available. It looks like you need to scroll, but you can’t.
In this instance, I’m on a 2017 15" MBP running OS 11.2.1. I’ll test on my other system later today or tomorrow.