--- loncom/interface/courseprefs.pm	2022/02/16 00:06:04	1.103
+++ loncom/interface/courseprefs.pm	2022/02/21 15:44:57	1.105
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler to set configuration settings for a course
 #
-# $Id: courseprefs.pm,v 1.103 2022/02/16 00:06:04 raeburn Exp $
+# $Id: courseprefs.pm,v 1.105 2022/02/21 15:44:57 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1501,7 +1501,7 @@ sub process_linkprot {
             if (grep(/^\Q$home\E$/,@ids)) {
                 if (ref($domdefs{'privhosts'}) eq 'ARRAY') {
                     if (grep(/^\Q$home\E$/,@{$domdefs{'privhosts'}})) {
-                        my %privhash  = &Apache::lonnet::restore_dom('lti','private',$cdom,$home,1); 
+                        my %privhash  = &Apache::lonnet::restore_dom('lti','private',$cdom,$home,1);
                         $privkey = $privhash{'key'};
                         $privnum = $privhash{'version'};
                         if (($privnum) && ($privkey ne '')) {
@@ -1593,7 +1593,8 @@ sub process_linkprot {
             my $reqitem = 'form.linkprot_requser_'.$idx;
             $env{$reqitem} =~ s/(`)/'/g;
             unless ($idx eq 'add') {
-                if ($current{'requser'} ne $env{$reqitem}) {
+                if ((!$current{'requser'} && $env{$reqitem}) ||
+                    ($current{'requser'} && !$env{$reqitem})) {
                     $haschanges{$itemid} = 1;
                 }
             }
@@ -5622,9 +5623,6 @@ sub menucollections_display {
 
 sub print_linkprotection {
     my ($cdom,$cnum,$settings,$rowtotal,$crstype,$noedit,$context) = @_;
-    unless (ref($settings) eq 'HASH') {
-        return;
-    }
 
     my %linkprotection;
     my $count = 0;
@@ -5669,7 +5667,7 @@ sub print_linkprotection {
         }
     }
 
-    if (ref($settings->{'linkprot'}) eq 'HASH') {
+    if ((ref($settings) eq 'HASH') && (ref($settings->{'linkprot'}) eq 'HASH')) {
         if (keys(%{$settings->{'linkprot'}})) {
             my @current = sort { $a <=> $b } keys(%{$settings->{'linkprot'}});
             $next += $current[-1];
@@ -5792,7 +5790,7 @@ sub print_linkprotection {
     $datatable .= '<tr '.$css_class.'><td><span class="LC_nobreak">'."\n".
                   '<input type="hidden" name="linkprot_maxnum" value="'.$next.'" />'."\n".
                   '<input type="checkbox" name="linkprot_add" value="1"'.$disabled.' />'.&mt('Add').'</span></td>'."\n".
-                  '<td>';
+                  '<td width="100%">';
     my ($usersty,$onclickrequser,%checkedrequser);
     if ($ltiauth) {
         $usersty = 'display:none';