Attempting to open a workflow task fails when using a Nintex Task Form.
-Open the workflow in the Nintex Workflow Designer.
-Open the configuration for the task action containing the form in question.
-Edit and Save the task form.
-Save the task action configuration.
-Republish the workflow.
-Run a new instance of the workflow to test functionality. The task form should be restored.
Republishing the task form may be necessary for each task form that you find is impacted. Republishing task forms and the workflow may fix any previously started workflow instances.