Hi, I saw a similar issue with a Cadence PDK I received recently. The crash seems to be caused by the techDisplays section of the .tf rather than the .drf itself (which read in OK).
;( LayerName Purpose Packet Vis Sel Con2ChgLy DrgEnbl Valid )
( L1 P1 L1_P1 t t nil t t )
( L1 P2 L1_P2 t t nil t t )
( L2 P1 L2_P1 t t nil t t )
( L2 P3 L2_P3 t t nil t t )
When I edited the .tf and removed the 'Packet' column it no longer crashed Glade 4.1.7 although it didn't seem to work as a tech file.
It may be a different issue or just a symptom but…