I'm so sorry bloasfist, may be it's me but, I can't see directories content with your xml files.Here are the skinfiles for Black Glass.
PS : I propose you to write here instead of there : https://forum.team-mediaportal.com/black-glass-456/added-support-file-explorer-71887/#post523061, for only one post.
CU
I forgot! I had to modify the common window.xml, because it has controls with <id>1</id> in it. Setting these al to 0 made it work again... I'll give feedback about this to the skin maker (Tgx), but for now use this modified common.window.xml. Could you doublecheck that this is the source of the problem? I'll upload a new complete package .zip when you can confirm that this is the problem.