Norm had advised me not long ago how to change the hamburger icon color. Using the "Class Manager", add the class .navbar-toggle .icon-bar - note that there is a space. A dialogue box will open asking if you want to replace the space with a dash - select "No, leave spaces intact." Open the class options and select the style settings paintbrush icon (not the "T" typography settings). Choose a color. This normally works perfectly for me - but on occasion I have had to reset the color several times in order to get it to remain permanent.