I've been hearing it for years... you need more power than normal to program a Tsunami decoder. Well, I finally got around to programming some of my DCC locos that have been accumulating on the shelf and I hit a brick wall when I tried my first Tsunami. The second and third were no different.
So, off to the internet to find one. Litchfield Station hooked me up for about 25% off. It came in today and I got it installed this evening. Works like a champ!