It happens with me too. I get the game free, i installed, and when i try to launch it, nothing happens, just syncronizing with the gog. I refreshed my DirektX, i tried start with another compatibility mode, but nothing. :(

I have the same !

when i press campaigen nothing happen .

I get an error stating that it can't change the reolution, this is after I got it running once, and its already at the needed resolution.

same!! i hope someone has a solution for this.

Same here, mac.

The same is happening to me: I got the game running once and now it won't anymore because of the resolution???

I don't have this issue, anyway, if you say that it's because a wrong resolution, you can change it manually editing the configuration file:

C:\Users\<USERNAME>\AppData\Roaming\Kalypso Media\Dungeons 2\config.cfg

# Screen resolution
graphic.resolution = 1920x1080

Same on my pc. I have installed it on my girlfriend's notebook and it works fine.

Ok I solved my problem.
The following error occurred when I tried to launch Dungeons 2:

Couldn't switch to requested monitor resolution:
"Switching to resolution 1366x768 failed, trying lower one
Switching to resolution 1366x768 failed, trying lower one
All resolution switches have failed
Screen: DX11 could not switch resolution (1680x1050 fs=1 hz=0)"

I just right clicked the dungeons 2.exe launcher file and,in the property, under the compatibility tab, I ticked "disable the full screen optimization"...and it works now!

Same for me!