Just to say I've found a workaround. Just identify the formatting of the offending items, in this case <h2> and <h3>, and set font-size: 0%. Then see what else is affected and change their style (eg to <h2a>).

A bit cheap and cheerful, but better to mess about with formatting you can see rather than deep surgery.

Cheers!

The title is set in the _archives.plugin.php which you find in the plugins folder:

		// Title:
		if(!isset($params['title']))
			$params['title'] = '<h3>'.T_('Archives').'</h3>';

This changes the 'Archives' on the Archive page itself. I think you need another instance for the title 'Archives' on the blog sidebar.

The development team is working on a new implementation of the Archives, so it is not a great idea to hack the code now and update it in a few weeks time. Also. you have found a solution. If the problem persists in an upcoming version, please let us know.