I have a list workflow that runs when an an item is updated. The list is a document library. Kofax (scanning solution) is exporting documents to this library. Every now and then, a document is exported to the library and nothing happens. There is no workflow error and no workflow history, the workflow doesn't start. In the ULS there are 4 entries at the time this happens, these entries can be viewed below. Any ideas why this is happening?