[Plugin: Adwit Banner Manager] adwit, banner sizes

Hi
i’m having trouble with adwit-banner manager, It will only give me one size of banner to upload. when i first used adwit, it used to give me different banner size options, but now just gives me a banner size of 250×250..i can’t select any other sizes to display..so i’m left with a border of 250×250, and an add must larger, with dosn’t look that great,
as you can see from the bottom right banner..

http://www.elliottwaveireland.com/?page_id=45

Any help greatly appreciated..

http://wordpress.org/extend/plugins/adwit-banner-manager/