Value List is not shown anymore

Hi all!

I would like to create a variable with a list of options (value list) for my pageflow (6.x).
Unfortunately its not working anymore. There's no options field but a simple text field with no content.
It's still working in documents which were created before 7.1.5.

Everything looks fine within the form preview (6.x), after initiating the process on the server ALL variables are shown as text fields.

Best regards