diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index b40438d4292..936a3b9cb53 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -1343,7 +1343,7 @@ class Form
             }
             $out.= '</select>';
             
-       		if (! empty($conf->use_javascript_ajax))
+       		if (! empty($conf->use_javascript_ajax) && ! $show_empty)	// ajaxcombo works only on list with no empty value because of &nbsp;
 			{
 				include_once DOL_DOCUMENT_ROOT . '/core/lib/ajax.lib.php';
 				$out.= ajax_combobox($htmlname);
@@ -4573,12 +4573,12 @@ class Form
             else
             {
                 $out.= '<select class="flat" name="'.$htmlname.'"'.($show_empty?'':' disabled="disabled"').'>';
-                if ($show_empty) $out.= '<option value="-1"'.($selected==-1?' selected="selected"':'').'>&nbsp;</option>'."\n";
+                if ($show_empty) $out.= '<option value="-1"'.($selected==-1?' selected="selected"':'').'></option>'."\n";
                 $out.= '<option value="" disabled="disabled">'.$langs->trans("NoUserGroupDefined").'</option>';
             }
             $out.= '</select>';
 
-            if (! empty($conf->use_javascript_ajax))
+            if (! empty($conf->use_javascript_ajax) && ! $show_empty)	// ajax combo works only when no empty value
 			{
 				include_once DOL_DOCUMENT_ROOT . '/core/lib/ajax.lib.php';
 				$out.= ajax_combobox($htmlname);
diff --git a/htdocs/core/lib/agenda.lib.php b/htdocs/core/lib/agenda.lib.php
index 7bc5b931c0e..3d51490f6b2 100644
--- a/htdocs/core/lib/agenda.lib.php
+++ b/htdocs/core/lib/agenda.lib.php
@@ -124,16 +124,18 @@ function print_actions_filter($form, $canedit, $status, $year, $month, $day, $sh
 		print '<tr>';
 		print '<td class="nowrap">'.$langs->trans("WorkingTimeRange").'</td>';
 		print "<td class='nowrap maxwidthonsmartphone'>";
-		print '<input type="number" class="short" name="begin_h" value="'.$begin_h.'" min="0" max="23"> - ';
+		print '<input type="number" class="short" name="begin_h" value="'.$begin_h.'" min="0" max="23">';
+		if (empty($conf->dol_use_jmobile)) print ' - ';
 		print '<input type="number" class="short" name="end_h" value="'.$end_h.'" min="1" max="24">';
-		print ' '.$langs->trans("H");
+		if (empty($conf->dol_use_jmobile)) print ' '.$langs->trans("H");
 		print '</td></tr>';
 
 		// Filter on days
 		print '<tr>';
 		print '<td class="nowrap">'.$langs->trans("WorkingDaysRange").'</td>';
 		print "<td class='nowrap maxwidthonsmartphone'>";
-		print '<input type="number" class="short" name="begin_d" value="'.$begin_d.'" min="1" max="7"> - ';
+		print '<input type="number" class="short" name="begin_d" value="'.$begin_d.'" min="1" max="7">';
+		if (empty($conf->dol_use_jmobile)) print ' - ';
 		print '<input type="number" class="short" name="end_d" value="'.$end_d.'" min="1" max="7">';
 		print '</td></tr>';
 	}