Whoo boy. Just finished a "simple" model. At least, it should have been simple. I think if I had used Carrara3 I would have been done hours ago. I was making a roll of tape. Created a cylinder. Added thickness a few times. Beveled the edges and duplicated a few segments to detail for the flappy end. Made selections of top, bottom, inside and set those to new texture zones. Then the UVmapper. Cylinder mapping for the edges, planar for top and bottom. Then go into editing mode, turn on "show merge candidates" and "show split handles" and waste about twenty minutes splitting the seam that Carrara insists on welding across the cylinder map. Cut in some edges and detailed the flappy part. Checked to see that the mapping lined up. Then my big mistake. Tried to weld the flappy part back in. Carrara created weird polys off in some other corner of the model and wouldn't undo. It also welded the UVs together across the different texture zones -- but I was prepared for that, at least. Sigh. Delete the weird polys, empty polys so I could see what I was doing, clean up the welds. Uh, oh. Can't fill polys...there's an extra vert on one edge. Triangulate? Nope. None of the tools will allow me to add an edge, weld the extra point, or fill the poly. So deleted the entire section I had attempted to weld, deciding I'd just go for the mesh break (it was, after all, supposed to be a SIMPLE model). But, oh no. When I deleted, Carrara apparently decided that I was trashing the texture zones as well. They are all gone. Not only that, the entire map has returned to the default spherical. Riight. After a little grinding of teeth went back into the UV editor. And of course. More phantom verts and the pop-up error message. Backed out, made marquees and hit "detach polygons" about a dozen times in a row. Back into the UV editor and the error messages have finally stopped. So back to all the mapping stages once more....apply mapping modes, scale results, then spend another twenty minutes in the hand-editing because of the stupid wrap-around seam. All in all, five minutes to make the model, and two hours of extreme frustration to finish it up.