All users from LDAP group not appearing in Spark

I have set up OpenFire on a windows server to share a particular Active Directory group. On windows 7, in both Spark 2.6.0 beta and 2.5.8 the shared group contacts appear, but only two of them (there are four). The other three users can see all four of us in the group just fine. The other users are all using windows XP. Is this a known issue with Windows7 or is there a setting that I am missing somewhere or ???

I have tried logging in on different machines, and using the sparkweb client. It seems particular to my user account (I was the first user and am one of the administrators).

UPDATE: Several restarts and a few hours later (the next morning). All my users are showing up. Typical AD wierdness perhaps?