Colors different when I use www in URL.

Then, sometimes after i visit the site both ways, it seems to be fixed.

you aren’t crazy – you lose the post background occasionally either with or without the www.
Have you tested this with other themes?

No, I have not tried that.

Who is hosting your blog?
I don’t think it is loading. Or it tried to load and then just gave up.
Yeah, I think it is your web host.

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This site is hosted at WebHost4Life. I am about to try a different theme.

Looks like changing the theme fixed it, not sure why….