I ran your skin on my desktop computer and it has directX9 installed. Audio Browser and Logo Selector works fine but background button.
I will try second method that you mention on the post after work and let you know.
and one more thing that GPS that I run IG4 seems to be none of function buttons(I set up as IG4 on the button) are works except exit. If I manually exit in the menu of IG4 then NAV skin remain until I press exit button(Only IG4 map screengoes off).
I will run some more test of all the menus and icons and let you know if I find any other issues.
Again, thank you