I have had Openfire and Spark running great with no problems for almost a year. All of a sudden this morning I recived support e-mails from people claiming after they login they could not see any contacts.
Mine was working ok untill I logged out and tried to log back in and had the same problem with office users on Openfire but all my AIM and G-Talk contacts load and I can chat with them fine.
We are running the latest versions of both Spark and Openfire with LDAP auth against AD. No errors in error log that pertain to this issue. Neither restarting Openfire or the server helped. Plenty of memory, plenty of HDD and java seems to be running fine.