So you want to block devices but allow others.
Did the policy change you made take affect on the client? Can you verify client has same policy as what is showing in the SEPM?
I trust you have seen this technote, which can be used as a template for what you're doing:
How to block USB flash drives while allowing other USB devices.
Article:TECH104299 |
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Created: 2008-01-28 |
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Updated: 2012-02-21 |
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Article URL http://www.symantec.com/docs/TECH104299 |
Can you check the log to see what it says, perhaps something else is being blocked and that needs to be excluded as well.