I installed it but when I click on the icon or link for Munin service monitor, the frame on the right is blank. Can someone tell me where to start looking for what the issue is? I didn't see any error messages when I installed the plugin. I also re-installed it and no change. Still blank.
How long did you give it to accrue stats? It has to gather stats, so it needs at least 30 or more minutes before data will be available.