Today I stumbled across another annoying feature of Windows Workflows whilst developing the HUB application for Make It Cheaper.
When you change the definition of a workflow any persisted workflows will no longer deserialized - often causing an IndexOutOfRange exception. I found a useful article on this at http://jhubsharp.blogspot.com/2008/09/fun-with-workflow-persistence.html
This article gives a work around using GAC - but it looks as if we will have to wait for Microsoft to resolve this in a future hotfix for a simpler approach
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