I have the same issue after updating to 3.6. If I deactivate Symple Shortcodes ver 1.3, I can make my edits. I have to reactivate it since so much of my site uses these short codes.
Are you all also using Symple Shortcodes ver 1.3?
I have the exact same trouble after updating to 3.6. The workaround that I found was to deactivate Symple Shortcodes ver 1.3. Then I can edit the pages and then reactivate the plugin.
Are you all also using Symple Shortcodes ver 1.3?
