diff --git a/mod/forum/index.php b/mod/forum/index.php
index fd91cc5fb6b..8c334ad3a51 100644
--- a/mod/forum/index.php
+++ b/mod/forum/index.php
@@ -208,7 +208,7 @@ if ($generalforums) {
                 } else if ($unread = forum_tp_count_forum_unread_posts($cm, $course)) {
                         $unreadlink = '<span class="unread"><a href="view.php?f='.$forum->id.'">'.$unread.'</a>';
                     $unreadlink .= '<a title="'.$strmarkallread.'" href="markposts.php?f='.
-                                   $forum->id.'&amp;mark=read"><img src="'.$OUTPUT->pix_url('t/clear') . '" alt="'.$strmarkallread.'" /></a></span>';
+                                   $forum->id.'&amp;mark=read"><img src="'.$OUTPUT->pix_url('t/markasread') . '" alt="'.$strmarkallread.'" class="iconsmall" /></a></span>';
                 } else {
                     $unreadlink = '<span class="read">0</span>';
                 }
@@ -335,7 +335,7 @@ if ($course->id != SITEID) {    // Only real courses have learning forums
                     } else if ($unread = forum_tp_count_forum_unread_posts($cm, $course)) {
                         $unreadlink = '<span class="unread"><a href="view.php?f='.$forum->id.'">'.$unread.'</a>';
                         $unreadlink .= '<a title="'.$strmarkallread.'" href="markposts.php?f='.
-                                       $forum->id.'&amp;mark=read"><img src="'.$OUTPUT->pix_url('t/clear') . '" alt="'.$strmarkallread.'" /></a></span>';
+                                       $forum->id.'&amp;mark=read"><img src="'.$OUTPUT->pix_url('t/markasread') . '" alt="'.$strmarkallread.'" class="iconsmall" /></a></span>';
                     } else {
                         $unreadlink = '<span class="read">0</span>';
                     }
diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 42a15351c37..bc54e2217f7 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -3727,7 +3727,7 @@ function forum_print_discussion_header(&$post, $forum, $group=-1, $datestring=""
                     echo '</a>';
                     echo '<a title="'.$strmarkalldread.'" href="'.$CFG->wwwroot.'/mod/forum/markposts.php?f='.
                          $forum->id.'&amp;d='.$post->discussion.'&amp;mark=read&amp;returnpage=view.php">' .
-                         '<img src="'.$OUTPUT->pix_url('t/clear') . '" class="iconsmall" alt="'.$strmarkalldread.'" /></a>';
+                         '<img src="'.$OUTPUT->pix_url('t/markasread') . '" class="iconsmall" alt="'.$strmarkalldread.'" /></a>';
                     echo '</span>';
                 } else {
                     echo '<span class="read">';
@@ -5608,10 +5608,10 @@ function forum_print_latest_discussions($course, $forum, $maxdiscussions=-1, $di
             if ($cantrack) {
                 echo '<th class="header replies" scope="col">'.get_string('unread', 'forum');
                 if ($forumtracked) {
-                    echo '&nbsp;<a title="'.get_string('markallread', 'forum').
+                    echo '<a title="'.get_string('markallread', 'forum').
                          '" href="'.$CFG->wwwroot.'/mod/forum/markposts.php?f='.
                          $forum->id.'&amp;mark=read&amp;returnpage=view.php">'.
-                         '<img src="'.$OUTPUT->pix_url('t/clear') . '" class="iconsmall" alt="'.get_string('markallread', 'forum').'" /></a>';
+                         '<img src="'.$OUTPUT->pix_url('t/markasread') . '" class="iconsmall" alt="'.get_string('markallread', 'forum').'" /></a>';
                 }
                 echo '</th>';
             }
diff --git a/mod/forum/styles.css b/mod/forum/styles.css
index ab25041379b..ab4b080f586 100644
--- a/mod/forum/styles.css
+++ b/mod/forum/styles.css
@@ -88,6 +88,8 @@
 #page-mod-forum-view .unread a:first-child {padding-right: 10px;}
 #page-mod-forum-index .unread img,
 #page-mod-forum-view .unread img {margin-left: 5px;}
+#page-mod-forum-view .unread img {margin-left: 5px;}
+.dir-rtl#page-mod-forum-view .unread img {margin-right: 5px; margin-left: 0; }
 
 /** Unknown Styles ??? */
 #email .unsubscribelink {margin-top:20px;}
diff --git a/mod/lti/locallib.php b/mod/lti/locallib.php
index 17666596baf..dccfcf4ae61 100644
--- a/mod/lti/locallib.php
+++ b/mod/lti/locallib.php
@@ -325,7 +325,7 @@ function lti_build_request($instance, $typeconfig, $course) {
 }
 
 function lti_get_tool_table($tools, $id) {
-    global $CFG, $USER;
+    global $CFG, $OUTPUT, $USER;
     $html = '';
 
     $typename = get_string('typename', 'lti');
diff --git a/theme/upgrade.txt b/theme/upgrade.txt
index 833e94334b4..8a6daee760b 100644
--- a/theme/upgrade.txt
+++ b/theme/upgrade.txt
@@ -16,6 +16,7 @@ deprecation:
 * c/group: Use i/groupevent instead
 * c/site: Use i/siteevent instead
 * c/user: Use i/userevent instead
+* t/clear: Use t/check instead
 
 optional changes:
 * new optional boolean parameter $withlinks for public function login_info() in lib/outputrenderers.php (MDL-31365)
@@ -33,6 +34,8 @@ optional changes:
 * new icons t/addcontact, t/removecontact and t/messages, previously t/addgreen, t/delete and t/log were used in messaging.
 * new icons t/unblock and i/twoway.
 * new icons i/courseevent, i/groupevent, i/siteevent and i/userevent (16x16) instead of c/* for calendar events.
+* new icon t/markasread (12x12) to replace t/clear used in forums.
+* new icon t/check (12x12) to replace t/clear which name does not reflect the icon meaning.
 
 === 2.3 ===