CC folder coice ad infinitum

Hi all,

i cannot upload or chose my calibre files anymore.
I installed CC a couple of days ago. Everything worked fine. I downloaded one book to my mobile phone.
In the meantime I uploaded further eBooks to my Kindle Drive. Today i wanted to check, if the new books can be found in CC.
I started CC and this is what happens.
I have to chose folders as long as there are folders. if there are no more folders to drill in -- nothing happens.
Only options: hoch / abbrechen
i have a screen video to show what happens... how can i upload?

I'd appreciate you help very much!

Thank you
Dirk