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I get the following exception on start up of MonoDevelop 2.8.2, it shows the beta update for MonoTouch, but won't download (this is a Mac).
Happens every time I start up. Seems to work other than not downloading updates.
System.NullReferenceException: Object reference not set to an instance of an object
at Xamarin.Ide.Updater.DownloadService.Download (System.Object o) [0x00000] in <filename unknown>:0
After re-starting my Mac this behavior went away, so downrank the issue...
This was caused by the downloader not handling failed downloads correctly.