Hello !
I found a bug using the physics behavior with sprites. I had this type of message for each sprite with the option 'immovable' activated :
Assertion failure: Physics polygon separation resulted in no polys
Stack trace:
assert2(0,"Physics polygon separation resulted in no polys")@http://localhost:50000/preview_prelude.js:12
([object Array],7396)@http://localhost:50000/Physics_behavior.js:554
()@http://localhost:50000/Physics_behavior.js:905
()@http://localhost:50000/Physics_behavior.js:811
([object Array],[object Object],true)@http://localhost:50000/preview.js:1035
()@http://localhost:50000/preview.js:1446
()@http://localhost:50000/preview.js:1203
()@http://localhost:50000/preview.js:515
()@http://localhost:50000/preview.js:463
(-10)@http://localhost:50000/preview.js:499