Hi Nicolas
I have renamed a folder so it is in the top now, because the window for choose product photos is to small. And I have to scoll 2 places to find the photo, not only one. Maybe you should make the window bigger or make it possible to resize with the mouse, just like you resize a browser or folder window in Windows.
Eveory time I need to add a photo the procedure is too long, when the folder is not visible.
I am sure I have renamed folders before without any changes.
Another thing I saw was if I make a new product, and it happens that there is another product with same name/ URL, then it goes to a error page after closing. Normal it just go back to product list.
I deactivated the custom_quantity now, maybe it makes problems.