Hi I have been experiencing infrequent and irregular mouse lag and acceleration and have since added "iPresentInterval=0" to "SkyrimPrefs.ini" and "Skyrim.ini" and I've added "bMouseAcceleration=0" to "SkyrimPrefs.ini" to try to fix them. These changes have eliminated mouse lag and acceleration BUT only in some interface menus. The menus that no longer have this problem are; escape menu, local map, world map can be fixed by bringing up the local map. So the point is I was wondering if anybody could take an educated guess as to why the changes have fixed the problem only on certain interfaces. If anybody could help me out that would be awesome. Thanks for reading. System: Window 7 nVidia GTS 250 (P.S.) I have also tried FPS Limter with apparently no effect. Also This problem persists whether SkyUI is running or not.