That shader I can not take credit for. Bond1 made that shader. But yes, for some reason if you are using it, transparency to 3 instead of 5 and it will work again.
Looking at the snow decalV2 one now.
EDIT:
So if you had some stuff that used Transparency mode 5 and it does not work, change it to transparency = 3. This makes the snow decals work again.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit