Yesterday, I was making a new web site based on my Routes plugin for WordPress, and I noticed that both the new site and my existing bicycle trails site were not displaying maps in Internet Explorer 6. This was due to a JavaScript syntax error (apparently most newer browsers could overlook this minor error, but not Internet Explorer 6).
So, I fixed the error, and today released version 2.2.8 of the Routes plugin. Upgrading is advisable.