When you play around in parking lots, ebrake turns, reverse donuts, that kinda thing... have you ever lost any gears?
I only did a few turns and when I left, I had to do so in 3rd. 1st, 2nd, and reverse were all locked out. This fixed itself after I drove about a block. What I noticed though is a lot of snow buildup on the transmission side of my engine. I suspect the linkage was plugged up by the snow.
Anyone else have this happen to them?