Clicksor intext white square problem????

Hi and thanks for reading,
you may know clicksor have in-text advertising.
I am having a problem on every site I try to insert this kind of ad in.
I recently created a blog and inserted the intext code and if you have a look
http://marcuswalsh.blogspot.com/
you can see in top left corner theres a huge white square appearing.
This happens on every site I try to insert this type of ad on.
Anyone give me any help to fix this? thanks!

See original post by Gnome