If you've ever been in a place thick with prims, you've probably seen it. At various places and times you stand still, and suddenly one leg sticks straight out, as if you decided to do a kick and then froze in mid-kick. If you move, the problem goes away, at least for a while... but back it comes, as long as your in a prim-heavy region.
Does anyone know why this happens?
UPDATE: a good friend tells me it's not the number of prims, it's whether you're standing on a level surface, or more accurately whether there's a discontinuity in the spot you're standing on. I guess that (1) the places I've been so far with uneven terrain happen to have been places with many prims and (2) unevenness smaller than I can (or do) notice suffices to produce the effect.