I am relearning to use AM and going through the tutorials but have found that none of the tool bar buttons on the top tool bar from Modeling mode all the way across to rotate mode save for render mode are clickable. IE no way to turn on or off skeletal display. Using the shortcut key I can turn on skeletal mode but not turn it off... Anyone else experiencing this problem?
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That's normal. They only activate when you need them....ie when you select a model in the chor.

Actually I have a model open in choreography mode I used F8 to activate skeletal mode and this above screen shot is from that point and time.

But is the model actually selected? Is it highlighted by its yellow bounding box?