There are two different lexicons for two separate quests. I know this because I had both on me at the same time. One you get from the docks of Riften and it already contains information and you are asked to return it. Completely, 100% unrelated, except that it is also called a Lexicon, is the one you do for the Elder Knowledge quest. That one starts out blank and needs to have information imprinted upon it.
So, not a bug, just the way it goes, and technically if you already did this some how then you should already have the Elder Scroll, or you left it behind and can just go get it again.
"Up until the driver update it worked", roll back your driver. Make note of any additional settings that disappear, and any different settings.
Skyrim: how to fix input lag and vertical sensitivity for mouse and 360 controller (PC) -YouTube
Most of these are ini tweaks. Try lowering your pre-rendered frames in the Nvidia control panel to 1. Cap the frame rate at 50fps.
Alternatively: (GameFAQs, --Helfire-1)
Enable adaptive Vsync (half refresh rate)
Enable triple frame buffering
Pre-render 3 frames
In the ini file: Mouse acceleration off {add bMouseAcceleration=0 to [Controls]}
In the standard options:
Distant object detail (medium)
My settings: (Like in the video, it also took me 9+ hours to get Skyrim playable and like you I forgot half of what I'd done)
fMouseCursorSpeed=2.000 (fixes annoyingly slow menu cursor)
fMouseHeadingSensitivity=0.2000
fMouseHeadingXScale=0.2000
fMouseHeadingYScale=0.2000
The above allows you to make 180 degree turns in a single gesture, also:
bFXAAEnabled=0
RadialBlurLevel=0
bDoDepthofField=0
bDoHighDynamicRange=0
bUseBlurShader=0
bGamepadEnabled=0
Interestingly, I find no MouseAcceleration setting in my ini (I'm unsure how many problems SkyUI and SKSE have solved for me.)
If you have applied any ini tweaks, DO NOT adjust anything from the in-game menus.
Best Answer
By default, Skyrim's vertical mouse sensitivity was lower than it's horizontal sensitivity. If I remember correctly one of the patches tweaked the way the setting that controlled this worked and left a few people who had previously tweaked the mouse scaling with problems. This was, however, some months ago...
Anyway, the setting for vertical mouse scaling is in
My Documents\My Games\Skyrim\Skyrim.ini(not the version in the game's install directory!), you want to look in the[controls]section, find thefMouseHeadingYScalekey and probably just remove it (and you should probably get rid offMouseHeadingXScalewhile you're there). This will reset them to defaults.Oh, and feel free to back the file up before making modifications.
If these keys are already not in the file, then I'm afraid you must have a different problem.