I just upgraded to SS 2.3.3 and installed the userforms module. An old form that I have shows up, but won't let me edit it. So I created a new dummy page, changed it to a userform page, then tried to add a field, but no luck. When I select the field type and click add, the browser gets redirected to /admin/EditForm and the page is blank.
Any ideas on why this would happen? Once I can add a form to a new page, I will deal with editing the old form.