I'm not sure whether this is technically a theme problem, or a Nintendo Network ID problem, but I just recently hooked up my 3ds to my ID that was on my Wii U, and now the theme that I paid for and downloaded BEFORE I synced my stuff is now gone and it says I have to pay again. Not a big deal only two dollars, but come on Nintendo, a little help here.
Already tried deleting the theme data and downloading it, but like I said, it's asking me to pay for it.