Hello,
I'm running SC on different linux boxes without any problems. After upgrading GNU libc from v2.2.5 to v2.3.6 slimserver.pl is not starting anymore. This effect is reproducable on different machines. The problem seems to be caused by the 'changeEffectiveUserAndGroup' function. If I disable the appropriate part of the function (line 874-879) SqueezeCenter starts without any problems.

The start command:
/usr/local/slimserver/slimserver.pl --daemon --pidfile=/var/run/slimserver.pid --user slims --group nogroup --logfile=/var/slims/log/slimserver.log --diag

The log entries:
[09-06-01 21:11:24.8381] main::init (270) Starting SqueezeCenter (v7.3.3, r25010, Sat Feb 14 03:03:45 PST 2009)
[09-06-01 21:11:25.0494] Carp::confess (270) Warning: Uncaught exception from user code:
        Unable to set effective group(s) to nogroup (65534) is: 65534 65534 65534: No such file or directory
 at /usr/local/slimserver/slimserver.pl line 878
        main::changeEffectiveUserAndGroup() called at /usr/local/slimserver/slimserver.pl line 332
        main::init() called at /usr/local/slimserver/slimserver.pl line 479
        main::main() called at /usr/local/slimserver/slimserver.pl line 1043

Used Perl version:
5.8.7

Used LibC version:
GNU C Library stable release version 2.3.6, by Roland McGrath et al.
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 3.4.6.
Compiled on a Linux 2.4.35-wt1-SMP system on 2009-01-05.

Deactivated source code:
874: undef $!;
875: $) = "$pgid $pgid " . join (" ", @sgids);
876:
877: if ( $! ) {
878:     die "Unable to set effective group(s) to $group ($gid) is: $): $!\n";
879: }

Regards,
Juergen