The title says it all:

I've tried running the game both from Galaxy as well as the .exe in the folder. I've used the fix/analyze function in Galaxy. I've run the .exe as an administrator, I've tried compatibility modes. Nothing. As soon as I start it, the screen goes black for a moment and the in-game cursor appears, but it quits out after about three seconds, and no process is left running in the background. I found a fix that says I should uninstall Citrix, but it's not even installed on my computer.

I had the mod editor installed, but I removed all that and even reinstalled the game entirely afterwards. Is it possible there's some residue of that somewhere that is mucking this up?

I did also try checking the regedit things, and I changed the display mode to borderless windowed, but it doesn't help.

I'm on win10.

Any ideas? Lots of people seem to be stuck on the loading screen, but I never even get there.

EDIT: Bafflingly enough, the game starts fine if I disconnect from the internet. When I reconnect, it immediately quits out without any error messages. Any idea what might be causing this?

Check if you can update you GPU drivers first.

The most common issues is the fullscreen setting. Change it to borderless fullscreen or window mode. Since you can't reach the main menu use a program that let you change game setting without loading the game like GeForce Experience or try this >>

1) press win+r
2) type regedit
3) go to
HKEY_CURRENTUSER\Software\Owlcat Games\Pathfinder Kingmaker
4) Open the Kingmaker.FullscreenMode* line
5) Change "1" to "3" there

This will set it to window mode, i personally use borderless. Exclusive fullscreen is the bugged one.

Bumping this thead to ask: did this issue ever get resolved? I have the exact same issue as jabber: reinstalling the game, updating graphics drivers, changing the fullscreen setting, etc. all didn't work. The game starts up and runs fine as long as I'm disconnected from the internet, but otherwise crashes instantly. I've disabled cloud saves and auto updates in the GOG launcher but it doesn't help.

Do you Citrix?
https://steamcommunity.com/app/640820/discussions/5/1642041106366124881/

Or try to run the game as a administrator.

What if you uninstall the game through Galaxy, then download the distribution from GOG and install it manually, without any client? There is no DRM in GOG games, you know.

No Citrix, running as admin does nothing. I haven't tried reinstalling outside Galaxy yet, but I'm cautiously optimistic about it. Thanks for the help!