I see that this (http://www.simplemachines.org/community/index.php?topic=245197.msg1970702#msg1970702) post was edited by Abedie (http://www.simplemachines.org/community/index.php?action=profile;u=6221) who is a regular member. (at least we see it like that :P) I don't think there is a permission issue but there might be a problem with setting the right member as the one who edited the post. Just wanted to let you know.
Also, there is a "colspan" miscalculation in Support Topics. There are 4 columns but "colspan" for topic title is set to 5.
Abedie, at one point, was a moderator here. We're looking into that :)
We are actually going to be doing a membergroup, board access, and permissions audit on the entire site pretty soon
I'll take a look in the supporttopics.php script. There are actually 5 columns, but only 4 for those who don't have the topic solved permission