DTM 2015 not loading

Hi guys, I recently downloaded RRE and purchased the 2015 DTM pack but it will not load any combination of car or track. All I get is a black screen with a flashing mouse.
If I go to single race through the normal RRE and choose a DTM car at Hockenheim it works fine but any attempt through DTM 2015 pack gives the same black screen. I then have to control, alt delete out to end game. This means I cant do a championship or anything

I uninstalled the game and reinstalled but the same thing happens.

Any help would be appreciated!

thanks
 
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