Check out this demo (http://www.strazer.net/ags/walkbug.zip).
Click on the marked spot on the bg. The character will walk from a scaled walkable area onto a non-scaled walkable area.
He will walk to the spot, stop, but keep animating, sometimes up to 2 seconds!
EDIT: Fixed since v2.61 RC 1
Thanks for the bug report & demo game - I think I can see where the problem is, I'll get it fixed.