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it's not zonealarm's fault, it's a security 'feature', not a glitch.
norton firewall does the same thing. it's a conflict of security, since XOOPS wants to know the referer, and the firewalls want to block the referer.
so neither XOOPS nor the firewalls are in the wrong, the users just need to figure out how to use their programs and enable http referers for their preferred sites.