If you're like me, you prefer the jcomments component over the K2 comments component. Unfortunately, using jcomments means that the K2 login module improperly displays the number of comments you have made on a site. At first I was going to just comment out ( <!-- code --> ) the code in the modules/mod_k2_login/tmpl/userblock.php file for the comment display. Instead, I figured out how that code was calling the database and made a few edits to this file: modules/mod_k2_login/helper.php
On line 70, I changed the php to use the _jcomments database in sql instead of the _k2_comments database.
$query = "SELECT COUNT(*) FROM #__jcomments WHERE userID=".(int)$userID." AND published=1";
I hope it works for you as well as it did me.
Now if only I could figure out on m own how to make it so that the k2 login module properly takes you to "my page" instead of just redirecting you to the homepage when you click it...
P.S. I know almost nothing about PHP, just went in and started looking at the code and figured out what it was doing and how.