[AshAbed]

On the forumhome of the 'Smooth Blue' skin above all the categories there's a little dot the color of the table's outer border(only when you're logged in). Many people make this same mistake and leave that there, its because in the table that guests see the conditional starts after the table is made so it still puts a table there if you're logged in, just an empty one which leaves the little box behind.
If you don't understand what I mean I can include a screenshot and better describe what's wrong... I'm sure you can figure it out though.