Problem compiling GPOS table

Can someone please advise us how to solve this export problem?

Have you tried to add a ‘use extension kerning parameter’?

Yes, we tried that and the export was successful. We just didn’t know exactly where the problem was.

The GPOS table can store ~64 kB data. Kerning and mark positioning will fill up that data quite quickly. When using extension lookups, each lookup gets 64 kB but the overall size will increase a bit. So it is advisable to only activate it if you need it.