tiger llosing minimize button?

Never seen it. Have installed any of the usual culprits like APE (plus any haxies)? Does it also happen if you use a new, clean user for about the same amount of time?
Ive read posts about this on other forums....someone said to try maximizing with the green button and then the yellow should return. If it happens again Ill post what happens....but if anyone knows rwhat causes this it would be handy to know... fryke I havent tried with another user.....whats APE?....and no hacks. Ive heard of ppl having issues with the 10.4.1 update thru software update....