[Plugin: PTM AJAX Comments] Problem with WP-Typography-Plugin

I installed PTM ajax comments on a blog that also uses the WP-Typography plugin and encountered a small problem:

PTM ajax shows strange characters like “” between normal letters in comment texts after submisson, if the comment is held for moderation and only shown to the user as preview after submission.
The comment text saved to the database is correct, however, and once accepted the comment text shows up correctly on the site too. It’s just that the preview is completely unintelligible and might cause users to think their comment wasn’t submitted correctly.

If wp-typography is disabled, everything works like fine.

http://wordpress.org/extend/plugins/ptm-ajax-comments/