One of my desktop has started to report the following:-

java.lang.ClassCastException: [Ljava.lang.String;
at com.zimbra.cs.account.offline.OfflineProvisioning. get(
at com.zimbra.cs.account.offline.DirectorySync.syncId entity(
at com.zimbra.cs.account.offline.DirectorySync.syncAc count(
at com.zimbra.cs.account.offline.DirectorySync.sync(D
at com.zimbra.cs.account.offline.DirectorySync.syncAl lAccounts(
at com.zimbra.cs.account.offline.DirectorySync.access $000(
at com.zimbra.cs.account.offline.DirectorySync$
at java.util.TimerThread.mainLoop(Unknown Source)
at Source)

I can run the normal ajax interface without problems from this same machine!

I'll keep looking but if anyone has any ideas when I might be doing wrong, please let me know?