I'm trying to make a "selection box thing" like in lemmings. I added a "Pick random" event to make sure only one unit is chosen if the "selection box thingy" overlaps two units at the same time. This crashes my game, but ONLY if the units have a behavior. If the units do not have a behavior it works perfectly. I'm not sure if this is a bug though or if it's just me doing something wrong.
Here's the cap: http://www.mediafire.com/?yznml0wdew1
EDIT: This cap is without behavior added, try adding a behavior to the sprite called "unit" (any behavior will do I think) and it should crash.