not sure about your specific tfs or visual studio version, however in vs2010 you have:

file > source control > change source control

enter image description here

if your solution/project is listed like above with no server name, binding etc., select it and click bind. that may get things going again


problem found

if visual studio 2012 is opened on the same pc and connected to the same tfs server, the tee behaves as described above :(

@edward thomson, i think it is a bug. tee should at least have displayed an error messages.

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