That’s what I suspected but when I looked earlier it was still showing up.
Are you willing to make a small code change in the core? This is, at the moment, more for investigation. If my hunch works then I can supply you with a more permanent and safe change that will be update proof.
So – if you are game the file you need is /simple-press/forum/content/sp-forum-view-functions.php
The function in that file you are needing is sp_TopicIndexName() as you already deduced. It is about two thords of the way down.
If you look at that function, near the bottom are two lines that both start $out = – you want the top one.
Track along the line until you find class=’$tagClass vtip’ and remove the word ‘vtip’ and the preceding space so you end up with class=’$tagClass’ and then save. Try reloading the forum topics to see if this has helped.
Remember to use a plain text editor only.