If you update your WordPress plugins (e.g., remove one) and have teh Recent Comments plugin installed, you may notice that its title reads %BEG_OF_TITLE%New Comments%END_OF_TITLE% after your change.

To fix it, go into the Plugin Settings and click the Update Recent Comments Options (you don't have to change anything) and the title will be fixed on your blog.

The Fix for WordPress Recent Comments plug-in %BEG_OF_TITLE% error article by Aral Balkan, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial 2.0 UK: England License.