Hi,
Try changing the name of the folder your skin is in. For instance, you said you are using dcarter-sq2; copy this folder to a new folder named dcarter-sq2-modified and then set your site to use the new skin.
If this doesn't work, you didn't change the proper stylemenu.css file and you need to figure out which one you changed and then make those changes in the \Data\sites\9\dcarter-sq2-modified\stylemenu.css file.
HTH,
Joe D.