Build 353 BGL problem

Build 353 refuses to index a number of old dictionaries in BGL format. They have worked correctly for years, with earlier versions of GD. GD 353 starts to do the indexing, but never completes it.
I have converted a couple of these dictionaries from BGL to DSL format, and the new format works, but that isn't a good option when dealing with very large BGLs.
I have converted a couple of these dictionaries from BGL to DSL format, and the new format works, but that isn't a good option when dealing with very large BGLs.