1.6.2 upgrade breaks WP theme

Same here. Breaks both Admin and the front-end. The plugin is apparently adding an   non-breaking space inside the body tag right at the beginning.

Developer: html-editor-syntax-highlighter.php has an empty line on line 49 at the end of the file after the closing ?> php tag. It’s better to omit the closing PHP tag at the end of the file to avoid problems like this.

@austen Blokker Thnaks for replay.

But – I don’t see empty line:

42         }
 43 }
 44
 45 if (is_admin()) {
 46         $hesh = new wp_html_editor_syntax();
 47 }
 48 ?>
~
~
~

Just make sure there is no extra space character after the ?> on line 48. I also found there is a space character on the very first line, very first character, that should be removed as well.

Fixed in 1.6.3.
THanks to developer.