In-game VSYNC not working properly after Anniv. Update

Hello fellow forum users.

At first I thought it was nVidia's fault but after testing several driver revisions (old and new) I believe there's something broken in the Anniversary Update w10.

I am mostly playing Grim Dawn and Left4Dead2, two games that were running quite well previously (and they aren't too much demanding either), but now I haven't found that invoking vsync from within GD doesn't work at all. I am not very sure about L4D2, but now I must have VSYNC forced ON under nVidia CP.

I recall to have read some AMD users with the same issues at the GD forum.

There seems to be a lot more stuttering all around too.

Any ideas?

Everything is up to date: chipset drivers, bios, etc w10 build 14393.105

It seems this is a known issue, at least for nVidia.