Actually - that could be a solpart issue - We are looking at changing it to the nav menu. I think I might get the skin updated so the css for the menu icon does not show the image - that will resolve that problem.
We haven't downloaded the latest version of dnn - still testing on dnnbeta - and dnnbeta is live, not local- but I do remember seeing on one of our test installs, that icons for the menus were missing.
It's not a problem of the skin but more likely dnn. Even if you installed the dnn 4 legacy skin method I am pretty sure it wouldn't help.
What we will do in the future is put in the css, where the icon class in - display:none and the images won't show up at all. It's really for administration navigation only.
Thanks for letting me know.
Life is too short to be unhappy!