The Viper does has the potential to go green, especially in humid countries such as Singapore when being used as an IEM cable. The sweat and climate does not mix well with the IEM cable. The Poison and litz cables will not have this problem.
For headphone cables, i have had no such reports, as the cable hardly makes any contact with with sweat and such.
After using the Viper, give it a nice wipe with a very slightly damp microfibre cloth, let it dry and then store it back it the bag it comes in with the 2 dessiccant bags that the IEM cables come with. This will help keep the cable dry from the humid climate, when not in use.
On a side note, the Back Widow is now available for IEM cables and headphone cables in a 26AWG version and being a litz cable, should not suffer from greening.
For OM IEM cables, the red would be right and blue dot left. When wearing the cable, the dots should be facing the ceiling, for correct polarity.