We run export, copy-pasted CNT member to all records and imported back - it seemed to work fine, no problems. The only warning file had was about password, which is fine (we actually need to reword this since these are not actually errors, just notices/warnings!)
Let me know if you have any further troubles doing similar things via export/import - we really want to get to the bottom of this to make sure none of our clients have any troubles with it.
Dmitry Buterin, Chief Apricot