I just upgraded to 1.68 about an hour ago and discovered that, if I use the scroll wheel on the captured minimap, only it zooms (using default minimap zoom behavior?).  Carbonite doesn't seem to capture or respond to scrollwheel zooming if the mouse is over the captured minimap.  Carbonite zooms just fine if the mouse is outside the captured minimap.

Nothing much changed with the map in 1.68 related to zooming except for the +/- buttons being added and I didn't change any mouse code for that. I just tested it and it works fine on my 2 computers. Try disabling all other addons to see if there is a conflict.