What the hell is OSCP?

[Jonathon Lamon]

When trying to log into the website http://www.sharebuilder.com/ I get 
the message "Error trying to validate certificate from 
www.sharebuilder.com using OSCP - corrupted or unknown response. Error 
Code: -8073."  I could log into this website in netscape before I 
upgraded from 6.2 to 6.2.1.  In Mozilla 0.9.9 Build: 2002031104 I get 
the message above.  IE works just fine with the site.  Is this a problem 
with the site, it's certificate, or a problem with the OSCP?