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Hi,
Sorry, but I can not understand your problem from the description you gave in your post.
Do you mean that previously you can PAN with moving two fingers on trackpad and now it zooms instead?
If so, and if you are using AutoCAD on Yosemite, be sure to install all Service packs, including the last one - SP3:
http://knowledge.autodesk.com/support/autocad-for-mac/downloads/caas/downloads/content/autocad-2014-...The accomplished README states:
"General Service Pack Updates:
Mouse/Trackpad
- On Yosemite, two fingers moving on Trackpad triggers zoom instead of pan.
- Cursor gets stuck in dragging mode, and file sticking with the cursor cannot be dropped."
Maxim