A simple workflow on a SharePoint 2013 doc library is not starting. The workflow should start under these conditions:
The doc library has check-out/check-in enabled. The workflow does not start whether the item's status is modified to Change Required, saved, and left checked out or whether modified to Change Required, saved and checked in. No workflow history. Nada. Thanks.
Just tested it with a docLib with checkin/out enabled. The workflow waits until the document gets checkedin to fire but it works fine for me.
This is the response I received from Nintex Support. I do not believe this to be accurate:
Thank you for providing that information. I believe that a workflow cannot stare once an item has been checkout of a document library it is locked by design.
Please let me know if I can help you with anything else.
Thank you very much,
Breanna Dennison | Customer Support Engineer