Module Last Forum Posts Broken.
In TW versions 4.x, the module Last Forum Posts will not display any post unless you are logged in as admin.
See http://dev.tiki.org/tiki-view_tracker_item.php?itemId=3076&trackerId=5&show=view&reloff=48&cant=65&filterfield=32&filtervalue=82&trackerId=5
Looks like this has been fixed in TW version 5.x