Hello there!
I have seen similar topic but without a solution. So I will make a new one.
I used to work in Autocad 2006 and now trying out AT 2012 before buying it and came acrose such an issue.
If I need to apply a texture to a curved surface (1/4 of cylinder in my case) in AT 2006 I use mapping and indicate 3 poits the UV to be applied. Furthermore I can use "fit to object" option which will fit the texture to the object (shrinking or stretching it). In AT 2012 there is different kind of mapping - there is no "fitting to object" so should I know dimensions exactly? And no indicating 3 points. Using cylinder mapping doesn't help me - texture won't show up. Have been playing around with mapping but no solution so far. Could you give me a clue please? What is step by step recomendation of applying a texture to such a surface?