Have a look at this attachment and see if you can find the missing link yourself. Otherwise, upload your assembly and we can have a look at it.
The first question I would ask is what version of Inventor are you using? The second is, are you sure you have the Content Center loaded, and all the paths to it established in your Options tab? Is this a Vault setup?
These are all important to narrow down why you are greyed out.
Running 2012, not vault, content center is loaded but under projects => folder option => content center files is pointing to a folder called **content center files\2012\ but nothing there.
Try this: Tools\Add Ins... look to see that Content Center is loaded (Startup/Loaded).
So, no Vault... then you have Desktop Content Center? Under Options\Files do you have a path set up for CC files?
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