Did you check that the grass files are actually renamed in flytampa/vienna/scenery/ loww_grasses01.bgl to 11.bgl Those should be labeled .off. Make sure you don't have both .off and .bgl files. I did all the things you said and it worked for one day and now it crahses again... I don't get it! As so...

I completely forgot about those files! Thanks for the quick response, appreciate it! Now it works. Thanks.

Greetings

I installed everything correctly and deactivated 3D Grass... it still crashes at night! What could be the problem?