folder icon beside topics

[catfish]

I was curious why some of the little folder icons beside the Topic titles are gray color (like my own) and others are not and popup appears on some when hovering.

[falkencreative]

Check the "viewing topics" section here: http://www.killersites.com/community/index.php?app=core&module=help&do=01&HID=9&hl=