A few days ago, my copy of Zone Alarm suddenly began failing to catch about half of all the spam I receive. Usually, Zone Alarm catches 99+% of all the spam I receive. This is happening on both of my computers. I haven't changed any of my Zone Alarm email (or other) settings. Has anyone else seen this problem? Any ideas on how to get Zone Alarm's spam filter working properly again?

Here's my ZA info:
ZoneAlarm Extreme Security version:
TrueVector version:
Driver version:
Anti-virus engine version:
Anti-virus signature DAT file version:996298455
Anti-spyware engine version:
Anti-spyware signature DAT file version:01.200910.6805
AntiSpam version:
ZoneAlarm ForceField

My computer is a Dell Dimension 8400 running XP-SP3. (As I said this is also happening on my other computer, a Dell Inspiron 700m running XP-SP2.)