diff --git a/boards/static/js/thread_update.js b/boards/static/js/thread_update.js
--- a/boards/static/js/thread_update.js
+++ b/boards/static/js/thread_update.js
@@ -346,6 +346,7 @@ function updateOnPost(response, statusTe
     var status = json.status;
 
     showAsErrors(form, '');
+    $('.post-form-w').unblock();
 
     if (status === 'ok') {
         resetFormPosition();
@@ -438,7 +439,7 @@ function updateNodeAttr(oldNode, newNode
         if (form.length > 0) {
             var options = {
                 beforeSubmit: function(arr, form, options) {
-                    showAsErrors(form, gettext('Sending message...'));
+                    $('.post-form-w').block({ message: gettext('Sending message...') });
                 },
                 success: updateOnPost,
                 error: function(xhr, textStatus, errorString) {
@@ -447,6 +448,7 @@ function updateNodeAttr(oldNode, newNode
                         errorText += ' / ' + errorString;
                     }
                     showAsErrors(form, errorText);
+                    $('.post-form-w').unblock();
                 },
                 url: '/api/add_post/' + threadId + '/',
                 timeout: POST_AJAX_TIMEOUT