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Boolean properties cannot be promoted in Windows Workflow Foundation (WF) 4. If you attempt to promote them, your workflow will appear to start but will not be properly persisted nor work properly. In effect, it will die silently. Client applications attempting to create workflows won’t see any errors. Only a few simple types are supported.
This took us about two man-days to debug. Apparently Microsoft couldn’t be bothered to map between Boolean and BIT, or to document this on MSDN, or to return an exception to the client…
Here’s the Microsoft link: