Lexor: Well, do you really think original publisher/dev would change something like this before giving their code to GOG? I think not. Steam and other online publishers' versions are working ok. GOG added some dlls
in some way and that is probably the reason for bugs to appear.
I know, but maybe they'll need to contact the original devs to know what exactly went wrong, perhaps a dev patch would be required. I don't know who disabled the DRM, was it GOG, or the devs. The bug may be generated due to the GOG specific additions, but it had to conflict in some way with the game itself. Therefore, a peek into the game code is a good idea, and afaik, GOG doesn't have source codes for their games.
Lexor: Crossworlds as an add-on for AP.
So i really do hope they'll fix this before AP hits GOG.;)