This doesn't get a standard form because I don't have a solid set of repro steps. But,
Expected Behavior
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Character only moves when arrow keys are pressed or map is clicked on.
Actual Behavior
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Sometimes character goes uncontrollably right (but never left)
How to stop
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Space bar (but not arrow keys or going to chat) stops character
This might be related to when map-based navigation is used. I only had it happen when I was going right via map-clicking and clicked on signpost. My character kept going right on the next street.
PS - Wow, that was a lot of bug reports. I think (hope) that's all