I've detected a pattern where I seem to be unable to connect Visual Studio (2012) to the Mac build server whenever a new Xamarin update is available. The Connect to Mac dialogue just displays the message "An unexpected error occurred while trying to log in. Please try again." (SSH Fingerprint is successfully retrieved.) Restarting Xamarin and Visual Studio, restarting the build server, etc. doesn't seem to make a difference.
I've specifically documented for my own benefit this happening four times now, and I believe it's happened before as well. As soon as I install all Visual Studio updates and all updates on the build server, everything works again. I've experienced this on both the Stable and Beta releases.
Is it an odd coincidence, or is there a systematic reason for why this seems to happen so consistently?