OK, got a regular terminal and can install Ultraedit.
Open up the file and find line 356. Looks like this:
if ('comment' == $comment_type) {
In the following code, note where it says in four places:
$comment->comment_author_IP
I would replace that with something like:
"0.0.0.0"
and try that. Please include the double quotes. I would backup the file first though just in case it didn't work.
You could probably do it where the comment is made but I would do it here just in case you want to go back.
I do hope this helps and I do apoligize that it took a bit to dig out.