Nice one! I'm using firefox and the "input-group cb" div, the one with "Include Ladder Runewords" only looks okay at min-width: 992px. Seems like the element is floating on the "form-group well searchWell"'s padding @992px. That whole form box div thingy seems to behave weird over all when going between width's. I'm using the newest firefox.
Other than that it looks really useful!
Thanks for the report, just pushed a fix for it (just in time for the ladder reset too!).