I'm new to WP, and it mostly works very well, but I'm seeing this issue:
I'm using the default theme (Kubrick), and from the admin pages if I click on "Presentation" and then select "Header Image and Color," any changes I make to the Upper Color and Lower Color don't have any effect. (Same if I use the Advanced option and type in the RGB values -- they're ignored.)
(Changes I make to the Font Color are reflected.)
I made sure the .jpg files in wp-content\themes\default\images directory were writable.