> Downloaded Mixer 1.25 and it works great, however, when I attempt to view certain graphics such as terrain and civilian buildings, I get them in the wrong color. I suspect this is a palet issue, however, I am unable to load a palet. How can I change this so I can view the buildings in their actual color?

if you go to the options, you can set the palet to automatic.If this doesn't help, you should find palets in the same mix file as the buildings, remember the name and select one of these palets manually.
This should fix your problem, if not, ask olaf, he knows what to do.