When I try to edit or create a new approval or notification action (it seems to be with all "User Interaction" actions), the text I entered in the Subject or message body is removed. All of the other fields -- such as "from", "Approval Options", etc -- remain fine and the workflows seem to operate fine.
This recently started happening in my DEV SharePoint 2013 environment. I have Nintex Workflow 2013 version 188.8.131.52 installed. Has anyone ever encountered this or know what would cause it?