markschum, I may have to do that, if no solution is forthcoming, but I would much rather learn how to fix it, rather than work round it, as it is likely to be a problem that I keep running up against time and time again. If I knew a way to rotate the entire UV space 90 degrees, I could split the obj into 2, fix the offending part, then reassemble as one obj, but I don't even know how to rotate the UVs for an entire obj.