I decided to take my youngish bruiser north of Seyda Neen in search of some experience with axes, given that he'd acquired a nicely enchanted one from a bunch of bandits who would obviously never need the thing again.
However, the last time I showed up in Seyda Neen, I got a message about a certain file not being present--and whether I wanted to run the executable, anyway. I said yes. Traveling north, I came across odd, while diamond-shaped force fields with yellow exclamation-point shapes in 'em inside some swamps, about where you'd expect to find one or two herbs. Can't interract with 'em, and they give off a hum.
Now, I've never followed this particular geographical course in the game, so for all I know, it could actually be a *feature*--though I'm highly doubtful, to say the least.