I was just testing this out because I wanted it to look correct on a mobile browser. When I resize Firefox (make it smaller), the header goes from purple to blue. This happens whether I just use the default or a sub theme and whether or not I set custom colors or use the default colors. It does seem to work on IE. My test site is https://staff.washington.edu/anyal/drupal7/. I have the latest Firefox.

Comments

Hmm, it shouldn't be blue but purple, since that is the main color in the header. I will check what is going on here.

Can you tell me which option in the color settings uses #0003e1

The same I've seen in the 3.x-RC6 version.

On my page jumps the header color from red / black to green by resize the site.

Looks here -> http://vdssl.onpw.de

Normal is my color settings:

Header Top color : #050505

Header Bottom color : #f74412

The same result in Firefox and Internet Explorer others i have not teset.

I have the same issue. If you visit the site www.microworldafrica.com open it on iPhone or resize your browser. You will see header color changes from silver to brown.
Please help.
Monsoon