Nozzle bug again

Well I suppose everyone remembers how the 6.03 caused nozzle files to paint the black square they sit in. It was some kind of bug which was fixed or was it in 6.1.

Anyway I've made lots of nozzles before, but suddenly for no apparent reason that I can work out I've just made a new nozzle and the old problem has returened and Painter is using the whole black square. All my old nozzles are OK. Does anyone have any ideas on this. Why this should suddenly crop up again.?? I'm using 6.1

Regards. T

Heres a sample of an old hose I made which works and a new one which doesn't