HTTP Requests Hang but No Info in Error Log (with LogLevel debug)

We're running apache 1.3.33 on Solaris 9 with WebSphere and Oblix (a
single signon/access manager facility) plugins/modules. After making a
small configuration change to both plugins' configuration files (since
undone), apache hangs after an hour. Users' browsers hang waiting for
a response from the server but there's nothing interesting the the
error log. When I restart with the Oblix module out of httpd.conf, we
run fine (but without single signon). Ordinarily I'd say Oblix is
clearly the culprit. However, generally when Oblix craps out, I see
connection refused messages in apache's error log. Now I see no such
messages. Even at LogLevel debug there's very little in there, I see
info level messages but no debug level messages at all. No indication
that, say, we've exceeded MaxClients (when I count the number of httpd
processes we're well below the max). So, I'm thinking, perhaps apache
is at fault. Any ideas? Thanks, Josh T