[oo_jazz_oo]

1) Yes, it only stays for a split second.
2) The rectangle draws fast, no lag.
3) It dissapears just as fast as 1, I dont have to click the level to make it disappear any more.

edit: As for #1&2, if I drag the tiles back and forth, the error just kind of flickers. I would assume its because as i drag it, it re-appears. But then as soon as I stop dragging the tiles, the error will disappear.