Currently Being ModeratedFeb 14, 2013 3:36 PM (in response to mppolzin)
System preferences > Universal access > seeing
you have blundered into built-in aids for uses who want visual enhancements.Mac Pro (Early 2009), Mac OS X (10.6.8), & Server, PPC, & AppleTalk Printers
Currently Being ModeratedFeb 14, 2013 4:41 PM (in response to mppolzin)
If the Control key is being pressed when you scroll, the screen will zoom. With some keyboards the Control key is at the lower corner, so it is possible to accidentally press it.
To unzoom, hold the Control key and scroll in the other direction.