Google translation (I speak French) Sundog thank you, but your explanation is wrong! Without SMP, the problems do not appear! In normal flight low resolution details, I fly with 30 fps on LSGS, which is correct (HDR is always off ) 30 fps : LSGS without graphic Problem 30 fps : LSGS without graphic Problem I can even push the resolution to a very high level, the fps drop dramatically (15; 14 fps), thus unusable. But the design has no problems! 15 fps : Unusable, but without graphics issues 14 fps : Unusable, but without graphics issues 14 fps : Unusable, but without graphics issues If I install SMP, graphics produced "iridescent blue" bad impression! this even with a low level of resolution!The proof is the fps to 35 or 40 !! The machine is clearly not push !!!! LSGL : Hospital : 38 fps !!!! approaching LSGB : 40 fps !!! approaching LSGB : 34 fps !!!LSGS Overview !! : 30 fps !! On the French site of X-Plane, other people with an AMD/Radeon video card had the same problem !! So you will need to review your copy !!