I also have MP problems with the GUI (no confirmation popup asking if I really want to leave the server) not working. Nor does the option to change sides, once initially chosen, work. Also, a drop of FPS by about 20% every 4-5 seconds which causes stutter like symptoms while on the ground. This is in MP only and it doesn't matter whether I'm running full screen or in "pseudo". It also doesn't matter if there are only 3 or 30 ppl. flying on the server.
In SP the FPS are pretty much constant at the same airfield (50-55 AVG). Settings are everything at max except for textures which are on high. 1920x1080 res. Driver version is 270.61
VSYNC does work now if I enable it through the nvidia control panel while in fullscreen mode. No functionality in "pseudo".
The game was reverted back to the last official patch version via steam file integrity check prior to patching. Cached files were also deleted. I was running 14305 before that with none of the above mentioned problems.
Cheers
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