Note about reproducing -- a push has to be initiated to see the issue. If you just enable monitoring and scount, the page

/network/monitoring/scout/index.pxt

loads OK.

The full traceback is:

[Thu Nov 08 17:28:21 2012] [error] Execution of /var/www/html/network/monitoring/scout/index.pxt failed at Thu Nov  8 17:28:21 2012: Cannot determine local time zone
 at /usr/lib/perl5/site_perl/5.8.8/DateTime/TimeZone/Local.pm line 27
	DateTime::TimeZone::Local::local_time_zone() called at /usr/lib/perl5/site_perl/5.8.8/DateTime/TimeZone.pm line 54
	DateTime::TimeZone::new('undef', 'name', 'local') called at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DateTime.pm line 1523
	DateTime::set_time_zone('DateTime=HASH(0x2ad35616bfb0)', 'local') called at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DateTime.pm line 451
	DateTime::from_epoch('undef', 'epoch', 1352391915, 'time_zone', 'local') called at /usr/lib/perl5/vendor_perl/5.8.8/RHN/Date.pm line 65
	RHN::Date::new('undef', 'string', '2012-11-08 17:25:15', 'user', 'RHN::User=HASH(0x2ad354e376c0)') called at /usr/lib/perl5/vendor_perl/5.8.8/RHN/DB/User.pm line 428
	RHN::DB::User::convert_time('RHN::User=HASH(0x2ad354e376c0)', '2012-11-08 17:25:15', '0.000000 %r %Z') called at /usr/lib/perl5/vendor_perl/5.8.8/Sniglets/ListView/ScoutList.pm line 65
	Sniglets::ListView::ScoutList::row_callback('Sniglets::ListView::ScoutList=HASH(0x2ad355bda440)', 'HASH(0x2ad355bede60)', 'PXT::Request=HASH(0x2ad337abf7d0)') called at /usr/lib/perl5/vendor_perl/5.8.8/Sniglets/ListView/List.pm line 1017
	Sniglets::ListView::List::render('Sniglets::ListView::ScoutList=HASH(0x2ad355bda440)', 'PXT::Request=HASH(0x2ad337abf7d0)') called at /usr/lib/perl5/vendor_perl/5.8.8/Sniglets/Lists.pm line 119
	Sniglets::Lists::listview('PXT::Request=HASH(0x2ad337abf7d0)', 'mode', 'scouts_all', 'class', 'Sniglets::ListView::ScoutList', '__block__', '\\x{a}    <formvars>\\x{a}      <var name="set_label" type="literal">sc...') called at /usr/lib/perl5/vendor_perl/5.8.8/PXT/Parser.pm line 160
	PXT::Parser::expand_tag('PXT::Parser=HASH(0x2ad354fd9570)', 'rhn-listview', 'CODE(0x2ad355ba6700)', 'SCALAR(0x2ad349022870)', 'PXT::Request=HASH(0x2ad337abf7d0)') called at /usr/lib/perl5/vendor_perl/5.8.8/PXT/Parser.pm line 72
	PXT::Parser::expand_tags('PXT::Parser=HASH(0x2ad354fd9570)', 'SCALAR(0x2ad349022870)', 'PXT::Request=HASH(0x2ad337abf7d0)') called at /usr/lib/perl5/vendor_perl/5.8.8/PXT/ApacheHandler.pm line 489
	PXT::ApacheHandler::pxt_parse_data('PXT::ApacheHandler', 'PXT::Request=HASH(0x2ad337abf7d0)', 'SCALAR(0x2ad349022870)') called at /usr/lib/perl5/vendor_perl/5.8.8/PXT/ApacheHandler.pm line 103
	eval {...} called at /usr/lib/perl5/vendor_perl/5.8.8/PXT/ApacheHandler.pm line 103
	PXT::ApacheHandler::handler('Apache2::RequestRec=SCALAR(0x2ad355063fb0)') called at -e line 0
	eval {...} called at -e line 0
[Thu Nov 08 17:28:21 2012] [error] Traceback sent to root@localhost at /usr/lib/perl5/vendor_perl/5.8.8/PXT/ApacheHandler.pm line 563.

Patch for the scout/index.pxt page:

diff --git a/web/modules/rhn/RHN/Date.pm b/web/modules/rhn/RHN/Date.pm
index 5df2daa..ebef623 100644
--- a/web/modules/rhn/RHN/Date.pm
+++ b/web/modules/rhn/RHN/Date.pm
@@ -34,6 +34,11 @@ sub new {
   my $class = shift;
   my %params = validate(@_, { -now => 0, -epoch => 0, -string => 0, -user => 0, from_zone => 0, source => 0 });
 
+  my $time_zone = 'local';
+  if ($params{user}) {
+    $time_zone = $params{user}->get_timezone;
+  }
+
   my $dt;
   if (exists $params{source}) {
     my $from = $params{source};
@@ -50,19 +55,19 @@ sub new {
     $dt = $from->clone;
   }
   elsif (exists $params{now}) {
-    $dt = DateTime->now(time_zone => "local");
+    $dt = DateTime->now(time_zone => $time_zone);
   }
   elsif (exists $params{epoch}) {
-    $dt = DateTime->from_epoch(epoch => $params{epoch}, time_zone => "local");
+    $dt = DateTime->from_epoch(epoch => $params{epoch}, time_zone => $time_zone);
   }
   elsif (exists $params{string}) {
     my $from_zone = $params{from_zone};
     if ($from_zone) {
       $dt = DateTime->from_epoch(epoch => date_to_epoch($params{string}, $from_zone),
-                                time_zone => "local");
+                                time_zone => $time_zone);
     }
     else {
-      $dt = DateTime->from_epoch(epoch => str2time($params{string}), time_zone => "local");
+      $dt = DateTime->from_epoch(epoch => str2time($params{string}), time_zone => $time_zone);
     }
   }
   else {
@@ -71,10 +76,6 @@ sub new {
 
   my $self = bless { dt => $dt }, $class;
 
-  if ($params{user}) {
-    $self->time_zone($params{user}->get_timezone);
-  }
-
   return $self;
 }

Another page that needs to be fixed is

/network/systems/details/history/snapshots/rollback.pxt

I have a fix. I believe that we will be able to change the Perl code to avoid using DateTime's time_zone local altogether.

Making bugzilla public, taking.

Fixed in Spacewalk master, 9a6c6950d8d66f61d6f07ad60bcaa9ed020d2e31, 5a0049556ca3b8a9fbaca979b1f659a26d4299a3, 75fe42d376b34c0a0cef0e7371b510346ec721a6, 108d293dd49cd20a8cc18fc47cde762ca258f6e9

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-1486.html