I cannot run freely anywhere in the game.
This is most-noticeable on stairs. If I am walking up a stairway, changing from a walk to a run, blocks the avatar's forward motion. It keeps running, but only in place. I also see this on other up-hill movements. (For example, going over the stone bridge across the lava pit in Eder Gira.) Forward running is similarly stopped when running across 'one-step-up' situations, like the "sidewalk" in the city square, and other "step-up" situations.
The bottom stair of the Museum, always stops forward motion; even when just walking. In this case, the avatar must jump onto the stairs from the doorway to get started upward. I think also related to this, sometimes my avatar behaves "trapped inside an invisible cylinder", and does not move forward or backward in any direction.