M9 White Balance
The AWB on the M9 is terrible in low light indoor situations.
My technique is to always shoot RAW, [Jpegs on the M9 are also useless], import into Lightroom and using the Auto Balance function. That usually gets you somewhere near. If you really need accuracy then us a 18% grey card and set the balance in-situ.
AWB in evenly lit situations is normally ok.
The M9 has quirks but it is a great camera once you get to know it.