not that it is a really big problem but I tried adding dispatcher entries with weights set to zero and started getting core dumps :)
Attached is a patch to correct for this.
lowered the priority on this.
Thanks Urtho - found the cause, working on a fix right now.
A fix is available on SVN trunk (rev 6322) - if you could check it and confirm that everything is ok, it will be great and I will do the backport to 1.6 also
Thanks and regards,
Backport done to 1.6