I've tried running userforms (both the stable release and trunk) in v2.3.4 and have had no success. It seems to install ok and looks good in the cms. You can create the page type and get all that tabs. However, I am unable to add new new fields on the form tab. I select the field type and press Add. A message 'Error Adding Field' appears in the bottom of the screen for any type.
I am taling my logs but no errors or warning appear. I'm not sure if I should do something somewhere to 'turn up' debugging.
Any help appreciated.