Recently Eclipse stopped picking up any new metadata components from the server. Via the Salesforce UI I am able to see new classes and VisualForce pages, but when I go to "add/remove metadata components" and hit the refresh button, these new components don't show up.
Worth noting is that I can still save, refresh, etc. all of the files currently checked out in my project, as well as add/remove any metadata components that were there before - I just can't get any new ones from the server.
When it was working in the past, I would click "refresh":
It would usually freeze up for a minute or two while it grabbed data from Salesforce, then show me a dialog indicating that certain component types are not supported:
Now, when I hit refresh the dialog opens almost immediately and none of the new components are available for selection - this tells me that for some reason there is no communication happening between Eclipse and the server.
Has anyone experienced this before? I haven't changed any settings that I am aware of, and the connection to Salesforce is otherwise unaffected.
I did manually edit package.xml somewhat recently, but I am fairly certain this was working properly after that.
Thanks in advance - let me know if I can make this any more clear.

