Upgrade to IS v10 now prevents printer sharing

I have just upgraded to Internet Security 10.0 but since the upgrade I can no longer share the printer attached to my main computer (desktop) I have two laptops that were able to connect to the printer via a wireless network, but since the upgrade neither of the laptops can now access the printer. When the firewall on the desktop computer is temporarily disabled, the laptops can access the printer. I assume therefore that there needs to be an 'Allow' rule for each laptop set up in the firewall 'Traffic' section of the desktop computer, but I am not sure how to do this. Any help would be appreciated.

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