Haven't seen this reported anywhere else, so:   
Been in DCS 2 for a few days, came back to 1.5 & after an update to 1.5.2.48726 there are no land surfaces visible.  All roads & buildings are there, but apparently sitting on the surface of the sea.   
Starting from a runway places the aircraft under the water.   
Using an nVidia GeForce 750Ti with 361.43 drivers.  Windows 10.   
Any ideas anybody??  :helpsmilie: