You've contradicted yourself from what I read. If Invis doesn't stack and the first one always wears off as you first say, then you are visible briefly even if the status icon remains. Since I have personally seen someone get aggro during that brief second of visiblity during the Tonko reapplication, I'm not the one that is wrong.
i do not know where you got either of these pieces of information, and i am not trying to come across as arrogant, but both of these are wrong. no invisible spell "stacks", what happens is this, whenever you cast any spell or use any ability invisible wears off, so when you are invisible and cast invisible, the first one wears off and the new one takes its place immediately. it works the same for any way to invis yourself including invisible, tonko, prism powders, hide and camoflague. the part about being visible briefly when recasting tonko is only in the animation, but the status icon is there the entire time, making you invisible to mobs.
EDIT: He started reapplying as soon as he got the 1st warning, so it didn't wear off in the middle of the cast. He was not aggro'd by a true sight mob, either.
Edited, Thu Apr 14 11:08:56 2005 by iniadelphinae