When i try and open the travel map in this game, it's entirely blank. This doesn't happen for the dungeon automap. I've tried running as administrator, but that didn't fix anything. The game also slows down and reloads all the terrain and trees, and i think it might be related, Any help?

So you are opening the travel map right? Not the local map? Because the local map will usually be blank unless you are in a town.

If you are opening the travel map and it is blank, there is probably something wrong with your DFU build. The GOG Cut has some mod incompatabilites so it can be that, but you can try just uninstalling and reinstalling the game.

Or you can try just installing DFU yourself outside GOG Cut and see if that fixes it. You would have to mod it yourself then though.