Hi,
My mouse has been acting strangely for some time now, and I believe I may have accidentally clicked on something I shouldn't have.
I can't rotate around objects with the middle mouse button (MMB), can't scale or pan with SHIFT, and SHIFT+S brings up the Insert Keyframe Menu. It's all upside down.
I've tried the solutions suggested by others on the internet, but I don't think my issue is the same as theirs.
This happens even if I restart Blender.