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BobH Validator (1.0.1286) does not understand that in GPOS Lookup type 7 (Contextual Positioning Subtables), Subtable Format 2, the PosClassSet values (offsets to PosClassSet tables) may be NULL. Instead, it is picking up the zero value and using this as an offset, and then generating lots of errors starting with E0040 "The data overlaps existing data"
(I don't expect it to matter, but in the font I have which demonstrates this problem, the Type 7 lookups are wrapped in GPOS extension lookups)
Bob
