Classifieds Plugin -> Cannot add a Dropdown to CustomFields

Dear support team,

I have the following problem with the Classifieds Plugin:

- when trying to edit the custom fields options within the CustomPress settings, I dont find the options boxes as you display them on the screenshots here (for checkboxes):

It doesnt matter wether I choose checkboxes, dropdown box or radio buttons. The options to define to values just don't appear (please see my attached screenshot).

What is the matter? I have updated to the lastest version of classifieds and I am using the latest wordpress version (3.6). Might there be a conflict with another plugin or browser addon?

Could you please briefly check and get back to me with a brief feedback? It is very much appreciated.

Thanks a lot and kind regards,