i have put the file in the europe terrain folder like you said and started a campaign there but the trees look worse now - see the image below.
also the the trees seem to be harmless in that the autopilot is follow waypoints and just flying straight through them without any problems at all. One, i would think autopilot knows better and two the trees need to be a little more solid
Also in the Apache Longbow - is it possible to move the cursor between the MFDs? i was looking at the left one up close but the cursor was just stuck in the MFD on the right- i recall on longbow 2 being able to seamlessly move it between them? or did i accidentally somewhere lock the cursor into just the right mfd?