edit:
A similar problem has started occuring in carb 3.201 in wow 3.2 (live). Bascially I entered an Argent Tourny tent (in Icecrown) with the map working fine. The minimap docked in maxed form and everything appeared to be working normally. Then when I left the tent, the minimap remained docked, while the detailed carb map had a sizable chunk of sholazar map and an offset Icecrown map. I tried Alt+M to switch between the two Carb maps. Both demonstrate the same problem.
Unlike the previous time I reported this problem, the map corruption remains over a much wider area. Flying east into Storm Peaks gradually fixes the problem when I'm about 25% of the way across Icecrown. The problem reoccurs as I head west and approach Icecrown.
Detailed alternate carb map broken:
Detailed carb map broken:
Note: minimap re-docked when swapping modes. I've altered the transparency of the minimap so that the problem is more visible
Non-detailed carb map working ok:
.. but reverts to broken detailed display when the map zooms in
At a guess I'd suggest the problem is caused Blizzards new subzone in Icecrown. But I'm just guessing.