yagsolved Kunena plugin doesn't work properly because the onAfterRoute event gets fired only for system plugins.

You have to convert it to a system plugin rather than a Kunena plugin and then it works fine.

This involves changing the XML to have:

<extension version="2.5" type="plugin" group="system" method="upgrade">


and the plugin file yagsolved.php to change the class line to be

class plgSystemYagSolved extends JPlugin


as well as changing the path lower down in that same file to

JPATH_PLUGINS . '/system/yagsolved/tpl/button_solved.html'


You might also have to rename the language files to system instead of kunena for it to use the language properly. 

en-GB.plg_system_yagsolved.sys.ini


Here is the locked code. This adds a parameter that allows you to lock a post when it's marked as solved.

In the XML add this with the other fields:

				<field name="lock_solved" type="radio" default="1" label="PLG_KUNENA_YAGSOLVED_LOCK_SOLVED_LABEL" description="PLG_KUNENA_YAGSOLVED_LOCK_SOLVED_DESC">
					<option value="0">JNO</option>
					<option value="1">JYES</option>
				</field>


In the yagsolved.php add this at line 105 at the end of the onAfterRoute function:

		// lock solved topics
		$lockSolved = (int)$this->params->get('lock_solved', 1);
		if($lockSolved === 1)
		{
				$Dbo->setQuery("UPDATE #__kunena_topics SET
					locked = 1
					WHERE id = " . (int)$topicData['id'] . " LIMIT 1");
				$Dbo->query();
		}


In the language file add this:

PLG_KUNENA_YAGSOLVED_LOCK_SOLVED_LABEL = "Lock Solved?"
PLG_KUNENA_YAGSOLVED_LOCK_SOLVED_DESC = "Setting this to Yes will lock topics when they are solved."


Also, I made the Solved button text configurable in the params by adding this field to the XML:

				<field name="topic_solved_button_text" type="text" default="Solved" label="PLG_KUNENA_YAGSOLVED_TOPIC_SOLVED_BUTTON_LABEL" description="PLG_KUNENA_YAGSOLVED_TOPIC_SOLVED_BUTTON_LABEL_DESC" />


And replacing this in yagsolved.php:

		$buttonCode = str_replace('{$solved_text}', JText::_('PLG_KUNENA_YAGSOLVED_BUTTONTEXT'), $buttonCode);

With this:

		$buttonCode = str_replace('{$solved_text}', $this->params->get('topic_solved_button_text', "Solved"), $buttonCode);


in the language file add this:

PLG_KUNENA_YAGSOLVED_TOPIC_SOLVED_BUTTON_LABEL = "Solved button text:"
PLG_KUNENA_YAGSOLVED_TOPIC_SOLVED_BUTTON_LABEL_DESC = "This is the text that will be displayed on the Solved button."