Nah, the problem is just with the delete query. You'll notice in your version it's looking for orders with a status of 0 whereas in the current code I posted it's using a %s and a function to get the order status name. This was one place where the order status changes slipped through the cracks. You can replace the code manually, update to the latest Bazaar version (will need Workflow-ng), or wait for Alpha 8 to come out. Shouldn't be too far away.