I have created a workflow assembly for Microsoft CRM 4.0, and uploaded it to the server, storing it in the database, using the Plugin Registration Tool v2.2 from http://code.msdn.microsoft.com/crmplugin .
So far all's well and good, I use it in a workflow, and determine I have some bugs.
I fix them, and update the assembly using the above mentioned Plugin Registration Tool.
From the error messages I am getting, the old assembly is still running.
I have even tried deleting the workflow, unregistering the assembly, re-registering the assembly, and re-creating the workflow, with the same results.
Is there something else I need to do to get it to use the new dll? wait ten minutes? shake a stick at it?