Just upgraded from Internet Security to Extreme.
I noticed the various problems raised over the last couple of months, but things seem to have moved on. The main problems I have are:
1. "Clear Virtual Data" from Forcefield resets some Firefox settings to default, e.g. under Tools> Options: Privacy>Remember History, Advanced>Update Settings... It doesn't affect the bookmarks.
2. ZA now can't remember my local network and comes up with the "New Network Found" prompt every time. It is an ethernet (non-wireless) switch/router and desktop PC. The old ZA versions would do this a couple of times and then remember.
Downloading a file via Firefox with forcefield on works fine, and lets me save anywhere.
Win XP SP2, fully updated, admin user
ZoneAlarm Extreme Security version:9.1.008.000
Anti-virus engine version:126.96.36.199
Anti-virus signature DAT file version:996088864
ZoneAlarm ForceField 188.8.131.52