[removed151214]

This also occurs at my similar setup. SubMenus don't appear until reboot, or very slow, or after resetting a section.

If submenus never appear, no matter how long you wait, then post a debug log and I'll look into it.

If they're just slow at displaying, this is a side effect of Gotham's new method of filling a list which they use (and will be mostly seen on slower systems like the Pi). It's possible to hack the skin to script.skinshortcuts alternative listing method (which is quicker, but doesn't integrate as nicely), otherwise there's little I can do about the speed.