Managed Debugging Assistant 'ContextSwitchDeadlock' : 'The CLR has been unable to transition from COM context 0x28ab560 to COM context 0x28ab4a8 for
60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a
very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to
the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment
(STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.'
One fix for the problem is to go to the Debug -> Exceptions -> Managed Debug Assistants menu in Visual Studio and uncheck the ContextSwitchDeadlock
From http://blog.wpfwonderland.com/2007/08/16/clr-has-been-unable-to-transition-from-com-context-for-60-seconds/
Update2. Visual Studio 2019+:
Debug -> Windows -> Exception settings
Uncheck ContextSwitchDeadlock
