Hi,
I just installed the UserForms module (0.2.0). I tried adding a form, typed in the name and whatnot, and when I go to the forms tab and click the button to add any type of field and the page reloads to a completely blank page (URL at top is admin/EditForm). When I go back to the admin page, it never added the field. Not sure if I can provide any other info on this as it doesn't seem to produce an error..dev mode doesn't say anything, firebug doesn't say anything.. I'm at a complete loss here.