Comment field missing from Network Places

I know this is a rather minor problem compared to lots of others,
but it is annoying nevertheless. I have a network with two Windows 2008
domain controllers linked across a WAN. After I installed some updates on
Wednesday night, the "comments" field disappeared from Network Places,
regardless of what server or workstation I used to browse the network. This
is rather odd. Which update in the last few months might have caused that
and what can be done about it? I also installed Trend Micro Worry-Free
Business Security 6.0 as an upgrade to 5.0; could this be responsible? I
noticed that it installs a network firewall driver (even though we aren't
using the firewall feature).