quota does not enforce quotas?

[Mathias Palm <Mathias.Palm@gmx.net>]

I am using kernel 2.4.17 with quota support and have set up quotas for
individual users so far. Everything works fine,
repquotas correctly reports quota violations, warnquota send appropriate
email to the appropriate user, and so on.

The quotas however doesn't get enforced. The hard, soft  quotas as well as
the grace time have been exceeded. but the user 
in question still can create and extend. 

Has anybody experienced the same recently? I looked through the mailinglists
and there doesn't seem anything related.
Am I missing something basic? 

Mathias

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