Intellisense in SSMS is not working

The Intellisense in my SSMS is not working.  I've checked the settings in SSMS and am sure Intellisense has been enabled.  Any other possible reasons to cause Intellisense to be not working?  Thanks.
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if you are on r2.

try some other fixes are sell documented here.

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Anthony PerkinsCommented:
SSMS 2008 does not support intellisense if the database is 2005 or prior.
thomaszhwangAuthor Commented:
I have installed the service pack, but my intellisense is still not working.  Any idea?

I'm connecting to a SQL Server 2008.

Thanks for both of your helps.
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Can you once again verify that it is enabled? you can check in the option menu.
thomaszhwangAuthor Commented:
Just checked again and disabled and enabled again, it is still not working...
thomaszhwangAuthor Commented:
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Microsoft SQL Server 2008

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