When synchronizing from Active Roles to Identity Manager for Group memberships the group update step will fall with the following error:
"Error resolving references of property (vrtMemberFPOResolved@group) for system object (CN=Users,OU=Groups=Group,DC=Domain,DC=COM)! [System.ArgumentOutOfRangeException] Destination array is not long enough to copy all the required data. Check array length and offset. Parameter name: binaryForm"
This will be fixed in a future release of Identity Manager. If affected by this issue please contact Support and request the hotfix for defect 29867.