You probably need to manually set the whitebalance setting of the cameras. Normally "auto" works fine, but sometimes you have to override it. You can do this from the web interface of the SX80.
However, once you do this, it will no longer adjust for the ambient light in the room, so if it's a room that gets sunlight (which varies through the day--even through blinds), this can be a problem.
I'd update the unit's software to the latest version, just to make sure this isn't a problem that was fixed.
