I am having the same problem with my ISPC3 install on Debian Lenny.
I've noticed my CPU LOAD for WEB8 is constantly at 80-100%. It ends up locking up my machine after a couple of days.
Anyway, I'm getting that same error in the error.log for the website.
(103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request
ISPC3 on Debian! It's great!