Still no joy. The nicks are not present in the paper before printer - it's as if one of the rollers catches one of the edges and bends it... arrgh.
I thought it might be related to having set up and configured the printer of surface that was less than 100% level and firm, so I've put in new shelf for it. But alas, same problem, Tried cleaning the print head and calibrating the printer again but nothing.
Arrgh!