Radio Button and DropDown: Cannot exchange Choices Text

Thank you for this wonderfull plugin. I’m using the “Pro” version (1.01) and might be I’m just to stupid to use the plugin in the right way.
Changing the “choices text” with checkboxes works finde. Everytime I’m trying to change choices text/value from the radio button it has no effect. It always comes back with the default text (“First Choise”, “Second Choice”, …)
Any help would be appreciated.

With best Regards

Markus

http://wordpress.org/plugins/calculated-fields-form/