diff --git a/lang/en/adobeconnect.php b/lang/en/adobeconnect.php
index 1e2ecb7..83d6591 100644
--- a/lang/en/adobeconnect.php
+++ b/lang/en/adobeconnect.php
@@ -165,4 +165,6 @@ $string['longurl'] = 'That meeting URL is too long. Try shortening it';
 $string['errorrecording'] = 'Unable to find recording session';
 $string['meetinfo'] = 'More Meeting Detail';
 $string['meetinfotxt'] = 'See server meeting details';
-$string['invalidgroupmode'] = 'Your course (or selected grouping) has no groups. Please configure groups or select \'No groups\'.';
\ No newline at end of file
+$string['invalidgroupmode'] = 'Your course (or selected grouping) has no groups. Please configure groups or select \'No groups\'.';
+$string['shortengroupnames'] = 'Course group names are too long (longest is {$a->max} characters). Total length of Meeting title (which will have group name appended) cannot exceed {$a->maxallowed} characters.';
+$string['invalidnamelength'] = 'Meeting title cannot exceed {$a} characters due to the length of group names in use.';
\ No newline at end of file
diff --git a/mod_form.php b/mod_form.php
index ef2d670..6d9b7b1 100644
--- a/mod_form.php
+++ b/mod_form.php
@@ -24,7 +24,7 @@ class mod_adobeconnect_mod_form extends moodleform_mod {
     /// Adding the "general" fieldset, where all the common settings are showed
         $mform->addElement('header', 'general', get_string('general', 'form'));
 
-    /// Adding the standard "name" field
+    /// Adding the standard "name" field - limit of 60 chars on Adobe Connect server
         $mform->addElement('text', 'name', get_string('adobeconnectname', 'adobeconnect'), array('size'=>'64'));
         if (!empty($CFG->formatstringstriptags)) {
             $mform->setType('name', PARAM_TEXT);
@@ -32,7 +32,7 @@ class mod_adobeconnect_mod_form extends moodleform_mod {
             $mform->setType('name', PARAM_CLEANHTML);
         }
         $mform->addRule('name', null, 'required', null, 'client');
-        $mform->addRule('name', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');
+        $mform->addRule('name', get_string('maximumchars', '', 60), 'maxlength', 60, 'client');
 
     /// Adding the required "intro" field to hold the description of the instance
         $this->add_intro_editor(false, get_string('adobeconnectintro', 'adobeconnect'));
@@ -180,6 +180,29 @@ class mod_adobeconnect_mod_form extends moodleform_mod {
             $errors['meeturl'] = get_string('invalidurl', 'adobeconnect');
         }
 
+        //Check constraints specific to group mode
+        if (0 != $data['groupmode']) {
+            // get all groups for the course
+            $crsgroups = groups_get_all_groups($COURSE->id, 0, $data['groupingid']);
+            if (empty($crsgroups)) {
+                // Check that the course has groups if group mode is on
+                $errors['groupmode'] = get_string('invalidgroupmode', 'adobeconnect');
+            } else {
+                // Check that meeting title is not too long in group mode (need to take into account group name length)
+                $crsgroupsmaxnamelength = $crsgroups;
+                array_walk($crsgroupsmaxnamelength, create_function('&$val', '$val = strlen($val->name);'));
+                //maximum course name is (meetingname - (1 + maxgroupnamelength))
+                $maxnamelength = 60 - 1 - max($crsgroupsmaxnamelength);
+                if (strlen($data['name']) > $maxnamelength) {
+                    if ($maxnamelength < 1) {
+                        $errors['name'] = get_string('shortengroupnames', 'adobeconnect', array('max'=>max($crsgroupsmaxnamelength), 'maxallowed'=>60));
+                    } else {
+                        $errors['name'] = get_string('invalidnamelength', 'adobeconnect', $maxnamelength);
+                    }
+                }
+            }
+        }
+
         // Adding activity
         if (empty($data['update'])) {
 
@@ -197,15 +220,6 @@ class mod_adobeconnect_mod_form extends moodleform_mod {
                 return $errors;
             }
 
-             // Check that the course has groups if group mode is on
-            if (0 != $data['groupmode']) { // Allow for multiple groups
-                // get all groups for the course
-                $crsgroups = groups_get_all_groups($COURSE->id, 0, $data['groupingid']);
-                if (empty($crsgroups)) {
-                    $errors['groupmode'] = get_string('invalidgroupmode', 'adobeconnect');
-                }
-            }
-
             // Check Adobe connect server for duplicated names
             foreach($namematches as $matchkey => $match) {
                 if (0 == substr_compare($match->name, $data['name'] . '_', 0, strlen($data['name'] . '_'), false)) {