Having been hit over the past week by the automated comment spammers, I've been trying to use, without success, the Mass Edit Mode to delete these comments en masse. I try and try and try, but the comments are *not* being deleted under Mass Edit Mode.
Here's what I do: I search for the common phrase, for example "video poker". I get a list on the screen. I go to bottom and click the invert checkbox link. All the checkboxes get checked. I click the Moderate Comments. I get a warning message. The screen refreshes, but the same comments are there, undeleted.
So at this point I go elsewhere in the Admin interface and delete them one by one, a very tedious chore. All comments are set to be moderated by me.
Is there some setting I've missed?
I will also give the solution of renaming the wp-comments-post.php file a try and see if that works.
Ten Thousand Year Blog (http://www.davidmattison.ca/wordpress)