@Therobster420 + others, can you provide a save line that always does that when unpaused? I've been trying to find out what's causing that bug but it's fairly hard to reproduce.
@redboy613, go to World Menu (the one on the right), and uncheck the toggle "Particles".
@Lavarious, renamed it to be a bit more informative, as people were using it wrong. It's "Reboot physics engine" in the World Menu links now.
Added the old list of keymaps in the World Menu buttons: "Default keymapping". I don't understand why anyone would use the default list anyways, it's unorganized and ugly. You could/should just press Enter and make your own keymap that is more organized, and something that you're actually able to remember.
@k978995, if caps lock is enabled, you'll spawn objects on click. Otherwise you'll interact. It's so you don't have to select objects over and over again if you, for example want to spawn a mountain of boxes - and for some reason, don't have an access to a keyboard.
Some people have reported stuff that I've already fixed, so please make sure you're running the newest version by refreshing this page with Ctrl+F5 (FF, IE, Chrome) or Ctrl+R (Opera).
Also, they weren't intended as object properties originally, so they probably won't work as well with every object, compared to the original Breakable & Crumbler.
 "Mutilate-a-doll"){kind=icon}
 "Mutilate-a-Doll: Classic"){kind=icon}