Hello,
i tried to double the problem with the uppercase folders, but i can't, can you provide more detail?
what i did:
created a folder on the sd card named asdf/asdf/Test , put some images in, started with clean config and selected this folder, started slideshow, quit, started again, worked
on which operating system did you create the folder?
was the selected folder the last in hierarchy, or were there subfolders?
thanx for any hints