Cann't assign Civilizaition Policies

Hi,

I bought GalCiv IV and played a few turns until I discovered the Galactic Policies feature.

There are two available slots, but I can't activate any policy from the right-hand list.

Double-clicking a policy or using drag and drop doesn't work.

 

When I try to drag a policy from the right and drop it into one of the available slots, it doesn’t snap into place but instead returns to the list on the right.

https://freeimage.host/i/FV2W8Fe

Is this a bug or a feature?

Is there anything else I can try?

It is version 3.0