Thank you for kind replies. I am sorry that my example was not musical enough for some; I was simply trying to illustrate in the simplest way possible that it was possible to write incorrectly notated bars. I am not sure that the note stem property is a factor. A further "doodle" attached ( in NW2 ) suggests that Noteworthy, or least Noteworthy2 only considers the value of the shortest note in the group to calculate the value of notes in the bar. The value of notes which are entered as chord against these shorter note do not count to the bar value. I do not remember seeing this behaviour in version 1.75, but I could be mistaken.
My first post for years on the Noteworthy forums but was prompted by the bizarre behaviour of the attach example. Has any of the esteemed experts have an explanation?
