Xpleet is correct.

Avoid too much radiosity in the render engine's Global Illumination (GI) lighting solution (corners too hot, too much color bleeding from one surface to another, etc.). Also avoid not enough radiosity (dark corners, splotchy walls). Do this by controlling the amount of indirect light in your scene via the skydome, ambient Vs sun slider (may have to set to "affects all lights") and the radiosity gain settings.

More controls are in the custom GI settings in the "User" render type "quality" slider Edit button. Here there are a lot of GI controls, including settings for the Radiosity Photon Mapping and other GI stuff. For example, splotchy walls should be fixable (at the cost of longer renders) by doubling (or more) the photons for photon mapping.

Be sure to read the Vue help for these settings.
 
If you want to learn more, I recommend Jeremy Birn's excellent book, "Digital Lighting & Rendering, Second Edition" (New Riders).

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'Art Head Start.com Free chapter, Vue tutorials, models, Web Tutorials Directory.