we have got an issue with using migrated NWF db from SP2010 to SP2013.
Situation: One configure and content db NW2010DB for SP2010. It was moved to new db server for SP2013 and was mapped and worked.
But when it is mapped in SP2013, the workflows on SP2010 fail to start with "Procedure or function 'CreateWorkflowInstance' expects parameter '@InstanceID', which was not supplied." So I have to go to CA - Nintex wf db setup - config database - edit and just confirm again values. Then it starts to work in SP2010 and doesn't work in SP2013. Migrated db for SP2013 is located on different db server.