Pixel Movement

Having this with both Sidescroller and Pixel Movement.

Descriptive Problem Summary:
At runtime on any demo, I get:

runtime error: bad index
proc name: slow down (/mob/proc/slow_down)
source file: movement.dm,336
usr: null
src: Kaamos (/mob)
call stack:
Kaamos (/mob): slow down()
Kaamos (/mob): action(1)
Kaamos (/mob): movement(1)
: movement()
: movement loop()
: movement loop()
runtime error: bad index
proc name: action (/mob/proc/action)
source file: movement.dm,241
usr: null
src: Kaamos (/mob)
call stack:
Kaamos (/mob): action(1)


over and over in an infinite loop.
I cannot move, but other things in the demo (AI, etc) continue to move around normally.

Numbered Steps to Reproduce Problem:
Run any demo

Expected Results:
Normal running, ability to move.
Actual Results:
INifnite looped error
Does the problem occur:
Every time? Or how often?
Yes, every time.