MyBB Community Forums

As you know, tasks will run using a virtual image in the footer template.
Sometimes, Some browsers, cache the task image and the tasks (or some of them) will not run!
The below simple plugin will solve this problem.
First of all, check that the following code exists in your footer template:

<!-- The following piece of code allows MyBB to run scheduled tasks. DO NOT REMOVE -->{$task_image}<!-- End task image code -->

If it doesn't exist, add it to footer template like this Sad

Mybb default footer template)

<br />
            <div class="bottommenu">
                <div class="float_left">{$lang_select}</div>
                <div>
                    <span class="smalltext"><a href="{$mybb->settings['contactlink']}">{$lang->bottomlinks_contactus}</a> | <a href="{$mybb->settings['homeurl']}">{$mybb->settings['homename']}</a> | <a href="#top">{$lang->bottomlinks_returntop}</a> | <a href="#content">{$lang->bottomlinks_returncontent}</a> | <a href="<archive_url>">{$lang->bottomlinks_litemode}</a> | <a href="{$mybb->settings['bburl']}/misc.php?action=syndication">{$lang->bottomlinks_syndication}</a></span>
                </div>
            </div>
            </div>
        <hr class="hidden" />
            <div id="copyright">
                <div id="debug"><debugstuff></div>
                <!-- MyBB is free software developed and maintained by a volunteer community. 
                     It would be much appreciated by the MyBB Group if you left the full copyright and "powered by" notice intact, 
                     to show your support for MyBB.  If you choose to remove or modify the copyright below, 
                     you may be refused support on the MyBB Community Forums.
                     
                     This is free software, support us and we'll support you. -->
{$lang->powered_by} <a href="http://mybb.com/" target="_blank">MyBB{$mybbversion}</a>, &copy; 2002-{$copy_year} <a href="http://mybb.com/" target="_blank">MyBB Group</a>.<br />
Theme Translation by <a href="http://www.mybbiran.com" target="_blank">MyBBIran.com</a><br /><!-- End powered by -->

<br class="clear" />
<!-- The following piece of code allows MyBB to run scheduled tasks. DO NOT REMOVE -->{$task_image}<!-- End task image code -->
{$auto_dst_detection}
        </div>
        </div>

if the above code exists in your footer template and still your tasks will not run or some of them won't run, install the following plugin. It may solve your problem.
Place it in inc/plugins

Mohammad-Za