hauna: I copied runtime.exe and patch.dll to my original version's directory, starting it then reproduced the error. So the problem lies within patch.dll and runtime.exe, no textures seem to have been changed.
I guess I should step in and say something, since it's my patch.
To prepare for any eventuality where a change causes anyone more problems than it solves, I always add config options to disable bits of the patch. If you open the file %APPDATA%\GOG\Nomad\config.ini, (create it if it doesn't exist already) and type into it
[Graphics]
GraphicsPatch=0
That will disable all parts of the patch related to the graphics, and get you back to what the cd version would look like. (If I try that on my system, it ends up looking like
this. I'd say my patch is a fairly significant improvement in that case. :p)
I have no suitable old computer to see what the game is supposed to look like, (and obviously, it doesn't work unpatched on any of my modern ones,) and didn't realise the random blueness wasn't in the original. I'll see if I can do something about it. I haven't seen the door glitch myself... Maybe it's already fixed in the new version of the patch I sent in to GOG, or maybe it's hardware specific or something. (Which would be a real pita...)
Edit: Tis easy when you know it's there. I've found the cause of the weird blueness and fixed it. :)
If you see anything else you recognise as not belonging, and you can make up a screenshot of what it should look like, a savegame nearby and instructions on how to get there, I'll take a look at it and see if I can get it looking more like the original.