That's an easy one.
Open /scripts/postlist.inc.php
Search for the line SELECT t1.USER_ID,t2USER_DISPLAY_NAME (Line 229 ?) and replace it with:
SELECT DISTINCT t1.USER_ID,t2.USER_DISPLAY_NAME
Do the same with showflat.inc.php
Solved within 2 minutes.
Rob
that just masks the problem as a bandaid.. the better solution is to ensure no dupes in the actual DB in the 1st place.. i wouldn't use that as a permanent 'fix'
ie: fix it in the admin world / DB .. that ripples outward with correct results..