Please upgrade to 2.3 here.
The 2.2 and earlier branches are no longer being updated.
I was wondering if you guys would perhaps be interested in a DB dump from a FluxBB 1.4 forum so you can add it to the exporter/importer.
I would blank out all the appropriate user info before I sent them to you, leaving only usernames. Passwords are stored as unsalted SHA1 (!) and I would replace them all with generic sha1 hashes of the word 'password' or '121212' for testing purposes.
The only catch is that it is a Postgres dump, not a MySQL dump. So you might have to add Postgres support to the exporter.