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A few months ago I blogged about a bug in the serialization code in Windows Workflow Foundation[1]. The bug is that when you change a custom workflow activity that is being used in a persisted workflow, you will get weird errors like ArgumentOutOfRangeException or an error telling you an IObjectReference is missing something. This happens when you ...

Earlier I wrote about a bug in Windows Workflow Foundation where it was no longer possible to resume workflows that were persisted in a SQL when you change an activity while there are persisted workflows in the database. After having created a small test I can confirm it's definitly a problem with the versioning of the custom activities ...

A few days ago Martijn and I had a really weird problem with our SQL persistence store for Windows Workflow Foundation. Martijn was trying to build a small application that had to start all workflows with a timer, so that the timers that were expired were handled by the workflow. Somehow he got an exception telling him there was a cross-reference ...