Start WED, right click -> add region.
Use the "Scale" Tool (between "Rotate" and "Edit Box") and experience a very strange behaviour in almost any direction.

EDIT: Using the box tool, I cant even select the regions.
EDIT2: It also seems the regions are not even recognized by region_find, no matter how I compile the level?!
EDIT3: Even if I use region_create and it returns >0, neither region_find nor region_check can find any region...