i think there may be a couple issues with some of the themes. i have downloaded darkwii_darkblue.4.xU.mym from the link in the first post. then i have applied it to a USA system menu.app, from 4.0 or higher.
the first thing i see that looks like it might be an error is the path "FIX/COMMON/ESRB/ESRB_FRA". in the normal system menu, there is "FIX/COMMON/ESRB" and "FIX/COMMON/ESRB_FRA". but in your theme, the second folder is inside the first one.
you can see the different here. the left is a system menu with your theme applied, and the right is an untouched system menu.
to confirm the correct path, i loaded the html and .app in question in an emulator and tried to get it to display these images. i went in the settings to the parental controls in the untouched system menu and in the version with your theme applied. you can see that the normal system menu is able to load the image, but the themed one is not
and the tool is spitting out this error
Code:
U8::GetData "/FIX/COMMON/ESRB_FRA/M.gif" was not found in the archive
also, i was messing around and i tried to change the country settings with the themed system menu. when I click the country button, the emulator spits out an error and then dies.
Code:
U8::GetData "/FIX/US/ENG/Country/EU_Country_flame.html" was not found in the archive
there is a file called "US_Country_flame.html" in that path. so it looks like either the html needs changed, or the filename inside the archive needs changed. but the way it is now, it tries to load a page that isnt there.
maybe somebody can confirm these things that has the theme installed on their wii.
darkwii blue USA 4.0+, country settings will probably give the opera error and you cant see the parental rating images if your wii is set to use french