Alright when I zoom in w/ the wheel, and press the number keys to change the size of the grid, it doesnt change, but there is like niches that do change. Its almost like a grid setting was changed, but i cant find it.
Heres a screeny, maybe you can help...?
Under the "grid" menu click on "show grid" and "grid 8". Also check the little eyeball icon and in preferances in the upper left corner to see if your settings have changed.
"Grid 8" is key 4. The eyeball icon is on the menu bar and you have it set on "2". It has three settings that change between different configuration of the control keys and mouse buttons. I like the one with no number. I also like the first window configuration on the left, in preferences, because it does not use floating windows.
Also, make sure you don't have "cubic clipping" turned on.