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Failing to authenticate package source (3 times) is blocked forever #2362
referenced this issue
Mar 18, 2016
Attached screenshots of the behavior after: 1) perform any NuGet operation that needs to authenticate with the MyGet feed, 2) cancel the login dialog 3 times, and 3) perform any other operation.
At this point mos tof the operations will report an error, but it won't be clear to the user that they need to close and reopen VS to unblock. Note that for the NuGet Package Manager \ Installed UI, the Loading... throbber will permanently spin.