I have no ideas, but just wanted to ask what database do you use, and also on what OS? Monitoring plugin stopped to work for me here. Well, not completely, but it doesnt show Statistics on that page, just a blank page is shown. This happened after some Openfire upgrade probably. It works fine at home on my test server. I wasnt able to find out what’s the problem is. I think Monitoring plugin developers should check this plugin, probably it has some bugs, but it is unlikely as they dont work with Openfire stuff anymore.