Phoca Mosaic - no folder tree

[FFKoglerau]

first of all, thanks for this great component :-)
I insatalled at my Joomla 6.0.3 and I can just see the images direcly in the images folder. The folder tree on the left side is empty. I can create a folder and see it in other components and by ftp but the new one is also not displayed in the mosaic component.
Any ideas?