1) x,y describe the position of upper left corner of rectangle with inscribed ellipse.
2) because jsui paints its contents (also do so on resize, lock/unlock patcher). As name suggests it’s for UI, and there this is desirable behavior. I used to do some animation in jsui but moved to jitter (due to – ironically – jitter of jsui)
3) i think it’s a yet another bug… inevitably ends with crash here [max 6.0.4 on lion]. log attached.