JUst had to do clean install. Reinstalled ZA pro. Have 2 other computers connected to mine using my BB through aTrust network starter kit. Initially ZA wizard appeared found network etc. added to zone trusted etc. However when ZA is on my other 2 kids cannot access the net, but on there comps is the icon showing my Bb connection and icon for network. Switch ZA off and away they go
In Zone Alarm Firewall/Advanced option, make sure that the it is set so that "the computer is a HOST for ICS". I don't have the Pro version anymore, but have a look in the Firewall options and it's there somewhere.