Hi Keith,
I've just found the issue in my case – there are blank lines between each of the stipple definitions in my Cadence display.drf and according to the message window the Glade parser only sees one stipple definition (presumably the first). Now I've manually deleted these blank lines from the .drf Glade 4.1.7 reads it (and the .tf) just fine.
I guess Python isn't quite the same Skill!
Cheers,
Keith W.