the raw processing seems to have a problem with artificial light in poor lighting situations.
Have a look at this thread for similar cases: Re: Raw Color Treatment
The only help I found to mitigate the problem a little was to use the raw fine tuning controls and adjust the boost sliders.
And you may want to use the feedback form in Aperture's -menu to send a bug report.
I haven't seen that problem specifically, but I would strongly encourage you to use Aperture's "Submit Feedback" to ensure the information gets to Apple's engineers. These are user-to-user forums so Apple doesn't necessarily read them. In the event that this is actually a bug (I don't know whether that's the case), it would be best to send on the data so they can know.