Queston on CSS Validation service

Thanks for your CSS Validation service.

Sometimes when I use it I receive:
No error or warning found.

Other times I receive:
Warnings (no warnings are listed)
Valid CSS informations
.
.
.

Why the difference?

Regards,

Bill Green
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vangreen@texas.net 
Bill Green 
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Received on Monday, 18 June 2001 15:15:45 UTC