I've tested furthur into this bug, what happens is when there's more then one mirc window, like having other desktop windows open, then when i highlight a tooltip for a toolbar button, and then move the mouse away from the button, either off the toolbar or onto a separator, it effectively puts the mirc window that was opened last, on top. Moving the mouse onto another button next to it doesn't cause it, only when mouse is moved off toolbar or onto a separator. Hiding the toolbar fixes the problem but alas i'd prefer having the toolbar visible. This bug happens 100% of the time when conditions i've specified are met, not just occasionally. Feel free to move this to the bug section if you can. If anyone has any idea how to kill the tooltips i'd really like to know how!