I have been have a persistant problem of missing terrain. It seems to be occuring in the same geographical location within the map(Both Caucasus and Nevada. It happen around the time deferred shading was introduced; really since updated to 2.5. No such issue was present in ver 1.5. Not much fun lately. Win 7 SP1 ultimate,Intel Xeon R CPU Quad-cores, 16GB DDR3 RAM W3520 @ 2.67 GHz,Nvidia GTX 750 ti, X-55 Rhino HOTAS