Dynamic Lighting problems in Curse of Strahd.

When I enabled Dynamic Lighting for my players and the Advanced Fog of War, as a GM I became unable to see what their line of sight was for anything. The map is now permanently illuminated as if they can see everything. But just for me, my players see the fog of war and the lighting just fine.

Try adjusting the Fog of War Opacity on the page settings. If you make it more opaque, you should be able to see the difference. If this is not the issue, please post back and we'll see where we can go from there.

Changing the opacity of the Fog of War didn't change anything no.

A couple more things to try, forgive me if you have already tried them, but I'm trying to be thorough: Have you tried selecting one of their tokens and using Cmd/Ctrl-L to view their sight? That should give you their view of things, although as GM, you will still be able to see tokens on the GM layer. Many of the maps of the castle in that module have Global Illumination turned on, meaning that line of sight is affected, but not viewing distance, nor do light sources affect anything. As GM, without using a token's vision, you will not see lines of sight, shadows or any vision blocking. I have tested this on a sample campaign to be sure there is nothing unusual in the setup. If you turn off Global Illumination, you will once again see a dim indication of individual light sources. Finally, if you feel you have inadvertently revealed any hidden areas in your testing, remember that you can use the toolbox to reset the fog of war (keeping in mind that it will reset the viewed areas for ALL players.)

It was indeed the Global Lighting that did it. Thank you very much.

No worries. There are a lot of funny interactions once you start using FoW, AFoW and DL, and I'm glad you've got it sorted. Happy Rolling!