On the same shared server other websites are hosted, some I trust many not ...
In fact don't know if it is a secure solution to have the IP added as Trusted in the Zones.
By the way, another way to have normal access again on the website seems to be
closing the browser and wait for half hour. Don't know exactly what happens,
but Zonealarm could forget the 'memorized' domain name and ... accept the new correct one.
I did previously ay only if the IP and it's domains are trusted, so the subnet would not make any difference regarding the trust factor.
You may have a point with the memory and the wait. The ZA does keep the past and current connections active in memory for a long period of time. I would assume just shutting down the ZA and waiting a minute or so and restarting the ZA would have the same effect.
Usually if the Privacy is to blame, just turning it off will either show if it to blame and possiblely allow the blocked content/sites to finally get through.