WebGL: iTween breaks, but only when not in development build?

I was playing around with trying to get an existing project to work in webGL, and found that when I attempt to tween an object, the webGL player locks up in what looks like an infinite loop of some kind. I haven't dived into the iTween code, but this is what starts the mess:


(The second Debug.Log is never reached)

Now, normally I wouldn't sweat it, because honestly I expect some code to break in the webGL version, especially with it in beta. What...

WebGL: iTween breaks, but only when not in development build?