[DrunkCanuck]

I don't know your entire situation but I might have had a similar problem last spring. I was in 2wd and spun out on some gravel, I don't know if I somehow touched the 4x4 low, but it engaged and wouldn't change to either 4x4 Hi or 2wd as I drove down the road. I finally got frustrated and pulled over, went in reverse about 10 yards while I pressed the 4x4 Hi button. It made the switch and then I was able to put back into 2wd. I have had no problems with any switching since (and I live in Edmonton, Alberta so the 4x4 gets lots of use in the winter).