1) You should contact Netflix and report it. I searched online and some Android users mention something similar with Netflix.
One person had a suggested fix but it involved things not accessible in Nook (and probably not in Android phones either) - turning off hardware GPU acceleration.
2) IT's a long shot but one person online said that changing screen to maximum brightness fixed it.
3) Do you have an AMOLED screen TV (don't even know if they exist).
- Have you tried other HDMI devices on that TV (a blu-ray player or such) If it also shows blueish, you have a faulty TV
- Have you tried the HD+/HDMI on some other TV (if it turns bluish you likely have either a faulty cable or faulty HD+)
- Have you tried exchanging the cable (if a second cable also shows blue, blame the HD+)
Off hand the momentary proper colors followed by shift to bluish seems to indicate a signal power problem to me... A capacitor or resistor resulting in saturating the blue channel (which is weird since HDMI is a digital interface, so capacitor/resistor should only appear in the D/A converter in the TV driving the display itself -- not in the HDMI to D/A logic. Signal cross talk on the cable might have an effect...