The reason for the 2.75m limit is to avoid overflow errors during coordinate manipulation. Xtreme needs "headroom" to be able to multiply, add, divide, (etc.) coordinates within signed 32-bit integers at all zoom factors and the maximum zoom factor can multiply coordinates by 256 times.
We have allowed a safety margin so you might get away with loading larger drawings but you run the risk of your document being rendered incorrectly at extreme zoom factors and it may become corrupted if you try to edit it.
PhilM
Xara Group Ltd Developer
http://www.talkgraphics.com/showthre...977#post237977