Until a few weeks ago, Zone Alarm typically caught about 99% of all spam sent to me, with few false positives. But a few weeks ago, Zone Alarm started letting through more than half of all spam. I haven't changed any settings and this is happening on both of my computers.

I had this problem back in 2008 and it went away, apparently on its own, after a few days, but this time it's not going away.

Does anyone have any ideas on what's causing this or how to fix it?

Here is my Zone Alarm set-up:
Windows XP
ZoneAlarm Extreme Security version:9.0.114.000
TrueVector version:9.0.114.000
Driver version:9.0.114.000
Anti-virus engine version:8.0.1.33
Anti-virus signature DAT file version:995073504
AntiSpam version:6.0.0.2383
ZoneAlarm ForceField 1.5.36.15
ZoneAlarm ForceField Spyware Scanner 1.5.36.15
ZoneAlarm ForceField Anti-Phishing Database 1.2.104.0
ZoneAlarm ForceField Spyware Sites Database 03.895

Thanks,
Joel