I've just upgraded to 3.8.1. I can't add fields to forms! After saving, the selected field remains in the library, no matter which content type. Adding to list works fine. I'm logged in as superuser.
- Saving the form acts like a reload - no "success" or "error" message - Switching from site form to intro or back leads to "Invalid token" - Found one content type where adding and saving works - here I can switch between the views