Brian, you were right -- it was due to different web addresses. I thought I had the same web address in both my computer at work and my computer at home -- apparently not.

"blah" one:
http://quake.wr.usgs.gov/recenteqs/latest.htm

colorful one: http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/special/California_Nevada.php

Barbara