Logic Pro 8 Channelstrip pop-up won't pop-up


In both my L8 - L9, the track-mode button (mono-stereo, left-rigth and surround) won't show up. It just toggles mono-stereo only when I click and hold. Anyone recognize this? I have trashed all preferences including logic preferences. I will probably have to re-install the whole OS and all software but before doing that.. I might try this question here. It could be something else blocking this particular function.
And is there's another option where I could do this switching?