Example 1:

https://puu.sh/FQ6J0/2b12c94085.mp4

Example 2:

https://puu.sh/FQ6OJ/47d00386ab.mp4

Example 3: Changing maps or restarting game seems to resolve.

https://puu.sh/FQ6Sb/6cb2924e43.mp4

Bug appeared on Forge map, twice now.

No keybinding changes, just a razer mouse that works fine this is not a hardware problem. 

When left mouse button is depressed character runs down.

When left mouse button is pressed quickly and released character paths to location, however, briefly runs down while mouse click is depressed.

Cannot navigate map well enough to fight anything.

You die. 

Update, seems to occur after surprise gift enchantment triggers. If I eat the potion that is spawned error rights itself.

Bug reproduction video!

https://puu.sh/FQ7zP/50741824c7.mp4