AirSync changes in Ver 9 ...?

What’s changes in the V9 implementation of AirSync?? I have a Zarafa mailserver installation that worked perfectly with emclient … vers 9 however, not so much … I’m getting the following error in conjunction with Contacts info …

[AirSync] Synchronizing folder list failed due to the following error: Input string was not in a correct format.

Is there a parameter I need to set?