@AHMan You must put your graphic settings for "scenery density" to the highest level.
There are no problems with your DLCs. Your problem only should be a consequence of your graphic settings.
Please check them and tell us whether it works or not.
Greetings,
Norman
EDIT: @BlueAngel Bitte die Antworten von mir und @curt2244 in den entsprechenden Thread von der U-Bahn FF verschieden. Danke.