Chosing image for new processes not possible

Thank you very much for this nice plugin!

I am using it already in my default language. When I am trying to make the website multilingual and thus create a second category with new steps which are assigned to this category – it is not possible to chose an image for the process. I tried already different browser and from two different domains – it does not work.

Do you have any idea how to solve this?

Thank you!