I am having this very same problem, I have tried every one of these suggestions to fix it and nothing changes, I played it for about 4 hours with that error and the game ran fine (some mods weren't working to their full potential, but game was running fine otherwise) then all of a sudden I logged into the game, got this same error and when I clicked ok, I had every available action available except for the mouse looking option, I don't turn, look up or down, can only walk in a straight line or strafe left and right, but can't turn, also if I open my menu (items, map, etc) and exit out of menu, my screen goes baby blue and can't see anything at all but baby blue.
I have tried uninstalling completely, reinstalling a fresh install of the full game (tested it and runs absolutely perfectly), then freshly installed all the mods (9 in total, not counting SKSE), once finished, tried opening one of my saved spots, same issue, no changes. The only ones I can load and still pan with the mouse is an old save from before I even tried using mods, however I still get the error 7 and guessing it would be a matter of time before I lose the panning feature again.
I have checked to see if SKSE is running on the first screen when entering the game, where you select continue by using the ~ key and typing getskseversion and it shows skse version: 1.7.3, release idx 48, runtime 09200000. Also says the SKSE version when I go into the quit screen when I am quitting out of the game. Please can someone tell me what is wrong and how to fix it? I have spent the last 4-5 hours trying various different solutions I have seen in various different sources and nothing is working so far.