Where does that text come from ?
I'm bug hunting for someone, and every comment that gets posted sees that error message. The comment is not posted to the site.
The error text is not in the WP code, nor in any plugins so because I can't find why it can't read an address, I can't try and work backwards from that.
All the code is new 1.5.2
I've a feeling it could be the comment form itself ?