Mis-reported Mail quota

Hi,

I am finding that a couple of domains are having problems with sqwebmail not reporting the quota properly.  If there is no mail waiting for one email address in particular, it will report 65% quota use. I have tried deleting the 'maildirsize' file, hoping that would fix it, but it does not. Has anyone else had this problem? If so, what help can be offered. I dont think that this is a problem with vchkpw, as it only is seen when sqwebmail is used. I could be wrong though, but any help is appreciated.

TIA,

Dave K.