VMWare Host Icon?

VMWare Host Icon?

Ok so one of my ESX hosts has a yellow exclaimation icon but there are no alerts or anything pointing out what exactly the problem is.  Has anyone experienced this and what did you do about it?
 
2nd question simply revolves around VSphere 4 and distributed vswitches.  Can opManager monitor the distributed switches or just the local switches?  Is it something that is going to be coming down the line?  My distributed switches are pretty important in my infrastructure.
 
Thanks for any help.
 
Adam

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