Apache::Session permissions problem

[Eric Schwartz]

I found a pretty useful article at 
http://www.linuxjournal.com/article.php?sid=4143 on how to use 
Apache::Session with Mason.  I followed the article, more or less, and 
ended up with this bit of code in my handler.pl to tie() my $session 
variable to an Apache::Session class:

  eval {
    tie %HTML::Mason::Commands::session, 'Apache::Session::DBI',
          ($cookies{$session_cookie_name} ? 
$cookies{$session_cookie_name}->value() : undef),
        {
         DataSource => $dbsource,
         UserName => $dbuser,
         Password => $dbpass
        };
  };

All the database variables are correct; I use them elsewhere with no 
problem.  The problem is that the session seems to be intermittent-- 
some pages seem to recognize it, others don't.  This smelled a lot like 
a problem where the session was getting set in one Apache instance and 
not others, so I wondered if the session was getting stored in the 
database correctly; after the previous eval, all I ever get in $@ is:

Permission denied at 
/Library/Perl/Apache/Session/SysVSemaphoreLocker.pm line 46.

Which seems to indicate it isn't.  I STFW, and found several people who 
seem to have had the same problem I have, but the solutions proffered 
involve ipcs and ipcrm, which don't exist on my Mac OS X 10.2.6 system. 
 Suggestions are more than welcome; I'm not quite sure how 
Session::SysVSempaphoreLocker got involved in the first place, since I 
don't explicitly reference it.

Mightily confused,

-=Eric