Appears some of the modders are having problems with recompiling scripts where the units walk animation fails to show.
Here's how to fix that: Decompile the script and go to the line where it says get CURRENT_SPEED > 5, in which CURRENT_SPEED = 29 so 5 will never be greater than 29.
To fix the problem add parenthesis around get CURRENT_SPEED > 5 like this: ( get CURRENT_SPEED ) > 5 and recompile; voila walk animations are back.
It's a known bug with scriptor, however, the information apparently was lost. So Good Luck.
Vaerun