From the original NZB specification:
subject string - A slightly munged copy of the article's subject. The segment counter (xx/yy) usually found at the end, is replaced with (1/yy). You can use the yy to confirm all segments are present.
There is no segment counter (xx/yy) in this NZB. Yeah one could say it is not needed, but the fact that we encountered this problem *just* now speaks for itself. Newshosting client NZB export implementation is WRONG.
However I've now covered this case also, so consider this fixed. Downside is you cannot be sure that all articles are there.