If anyone would like to test out a proposed fix for the "actor inside region" issue - please save the attached "engine.swc" in your StencylWorks/plaf/flash directory (you can back up your existing file if you want).
To recap, the issue is that if an Actor is inside a region, and you use blocks to set the x,y position of the Actor to move the Actor outside the region -- the region may still report the Actor as being inside it.
This patch should solve the issue for the majority of cases. It may still fail if you're using a circular and/or polygon region and you change animations such that the collision box jumps in or out of the region. Hopefully this is a rarer situation and the fix will correct the most typical scenarios.