yeah i had the same problem, kindof an inconveniance, i even tried to unistall and reinstal but it didnt work either. please help autodesk.. WHERE IS THE DIAGNOSTIC SHADING palette????
Try choosing a different workflow under Preferences > Workflows?
Some do not have the diagnostic shade in the control panel.
In 2013 toggling to 'default' no longer briings up shaders and visual states docked inside the 'Control Panel'. Anyways, toggling over to default every time I want to shade would be a pain...
However, one can now middle mouse drag a shader into their pallete or shelf. So pull down 'Object Display' > 'Diagnostic Shading...'. When that window opens you can mmb drag the shader to wherever you like, even your 'Marking Menu'.
If you can't see the 'Diagnostic Shading...' make sure you have long menus truned on, Preferences> Menus> Long Menus
A little on this, you can also customize the settings and create different ones.
When you are done close out the "Diagnostic Shading...' window for a clutter free workspace.
Since Alias 2013 my Control panes at all was away. I have to click it manually on Windows Control Panel and it isnt aligned any more on the main screen.