Environment: 7.4 Service Desk (may also affect other versions)
When running a knowledge search you click on the Create Article link and a new article window appears. You type in the details but when trying to save the record you see the message:
"This article has changed status, and the action you selected is no longer available. Please redisplay the window and try again."
Within Process Designer you will need to alter your default article process. To do this, set another Article process as default then deactivate the process to alter. Amend your default Article process to ensure that the "Add Object" action is made available as an optional action at the open status (in this case "Created").