Window background color:

I do enjoy using Blender. I was having problems with 2.59 for Mac 64 bit.
•boolean acts differently every time I use it. ( if you click the eye ball it works better but I still need to edit vertices)
•New problem: Background window color is dark medium grey. I changed it to blue green dark color in user prefrences.
(It changed imediately, but I close window with new window and grey is back. So I reset and checked default button to save)
That setting is staying at blue green background color, but the window is still grey. ??

Note****
I have just upgraded to a new hefty mac. Same problems.

I also wonder how to render a descent image. Is there a Bake option for high resolution renders with 2.59

I am using 2.59

also weird images on screen in render view. I get an image on a layer a small helmet that I drew. I look in all the layers and have given up.
I have learned Very much in a week. I wake up and go to bed thinking about blender. I would like to see mac and blender get along better.
I think positive. I dont see the outcome now, but I am getting closer. lol

thanks for the time you put into all you do.
ps I have tried many tiimes to send yo attachment. errors. sorry. will think of a web page to link