Disable the setting in LPE then go back to options and change it back to enable iTunes. Or is this not having any effect?

Is it being unreliable or not working at all?

Sometimes when my LPE has been running as an ultrapeer for 2-3 days it suddenly shows as being firewalled and drops down to 23 peers. It is my guess LW has lost its communication with the router via UPnP. Usually a restart of LW and all is fine. It's my guess it is a similar situation with LW and iTunes via the DAAP and Bonjour protocols (Bonjour and UPnP supposedly have similar discovery techniques.)