I am running Map3d but believe this is fundamentally a vanila autocad issue. I have been searching for a solution for weeks and am surprised nobody else is having this issue.
When using my mouse wheel to zoom, the mouse pointer suddenly jumps to the top left corner of the autocad window. I don't notice at first, but suddenly the perspective of my zooming has become relative to that point. Sometimes I get 2 or 3 scrolls normally, other times it jumps right away. I thought it was my wireless mouse, but have had the exact same issue with a microsoft usb mouse. I have checked the middle mouse button settings and tried various options but no luck.
I am running on a new laptop with i7 processor, 20 Gig ram, nvidia gtx 670 mx video and Win 7-64 (especially installed for Map3d compatability with SQL server). Any help would be greatly appreciated before I go totally insane!