Thanks once again for your help. Something must be wrong with the installation. I tried starting a campaign, skipped the tutorial, but when the game starts I see the image with weird colour patterns (mostly white, some red and green squares and some visible spaces where I can see the environment but were very small). As soon as I exit the game it shows the game report and all is fine. I see the submarine port and houses, no more weird image.
EDIT: I merged the add-ons from NewTDCui and Open Horizons to their main folders, gonna try installing them separately through the generic mod enabler
