Try this:
Go to Window> Settings/preferences> Color settings.
In the color settings window, go to: Edit> Restore to defaults.
This should restore your view ports color.
www.stevenegan-cgi.com
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
"Yes."
[long pause] "Friend!!"