I have been having problems with VP3 running on my MacBook Pro (Monterey). The app would open, but the dialog box was completely empty of any information or controls. That is, all that was displayed was a blank dialog box.
The same problem existed for 2 of the Nik modules - Viveza 3 and Perspective FX - and I asked if anyone else was having this problem. No one was, so I started looking for what, on my system, might cause it. The first thing I did was check to see if the problem existed in Safe Mode, and it did not, so it was clear that it was related to one of my startup apps. It turned out to be something called QuickShade which is available in the Apple App Store, but which caused all of my problems when run as a startup app.
Just a warning that there are some apps in the App Store which might cause problems with some Dxo software.
Incidentally, QuickShade only seems to cause this problem when run as a startup app. If I run it after logging in I do not see the same issue.