It seems on at least small planetoids that, if you walk far enough, your player can be parallel with the ground - making movement anywhere but 'downhill' very difficult. Curiously this does not seem to apply for the jump trajectory/gravity calculation, although the direction of the jump follows the player orientation. Logging in or exiting a vehicle aligns you to its orientation (and not the planetoid's gravity). Sorry if this was reported before; it seems simple enough someone must have encountered it before, but I couldn't find anything via search.
Addendum: swapping avatars results in the swapped-to avatar having the orientation of the swapped-from avatar - either that, or it's random/just horizontal.
Addendum: swapping avatars results in the swapped-to avatar having the orientation of the swapped-from avatar - either that, or it's random/just horizontal.