F11 (Fullscreen) Crash/ Inventory Possible Exploit! (1.5.2)

Keep in mind: I had 21 Iron in my inventory and I 19 in a furnace. I took out the iron (40), then this happened.

I pressed F11 and the game crashed. I'm pretty sure that it was because I didn't have Fullscreen Mode on in Video Options.

Then Windows just said that "Java(TM) Platform SE Binary has stopped working" then I just clicked "Close Program"

I reloaded my world (w/newest launcher) and I still had the 40 iron in my inventory AND there was 19 in the furnace! The inventory saved before the furnace!