Using Short Code with Custom Posts

Hi

I have managed to get this to work with Posts from a Custom Post Type tag:

taxonomy=”portfolio_tag”
on_single_display=”local”

[cool_tag_cloud style=”purple” font_family=”Arial, Helvetica, sans-serif” smallest=”12″ largest=”17″ align=”left” font_weight=”normal” text_transform=”none” number=”0″ order_by=”name” order=”ASC” taxonomy=”portfolio_tag” tooltip=”yes” nofollow=”yes” animation=”no” on_single_display=”local”]

But it seems to only be picking up the global display and showing ALL the tags even though its set to “local”.

Is there a limitation in the Short Code method that prevents it from showing the tags related only to the Custom Post Type post?