Groupwise 8 HP1 on SLES10, Client Build 85855 running on XP SP3

On a user account who has an address book shared with a number of people, they are not able to add/remove people from the Sharing List...

It will get as far as the screen where it asks you what message you want to send them, then when you click OK, it crashes.

GWCHECK Fix/Repair - Structural Rebuild on user has had no effect.