Help Menu buttons NOT SHOWING?

[Mogen1000]

ICS has a very nice sleek built-in menu button, back and task manager.

But now it dosent show. I just rebooted the phone and it worked, but is there a reason for it, just a bug?

 

[ZeroOne]

Funny i had the same thing happen to me today
i am running a custom rom so i thought that was the
issue. if you had it i am curious i guess its a bug maybe
a little one it was the first time i had this happen since i have
had this phone.

 

[Tunga]

The legacy menu button only displays when an app specifically requires it, it is otherwise hidden. Note that the stock apps generally use the new menu bar design and do not use the legacy menu button.