Deleting uneeded series

 I'm not having much luck deleting series that were created, but now are not needed.  I have searched the knowledge base, but I do not find anything (of course my searching skills are suspect.)

I right click on a series in the Business Modeler and select Delete.  I get a dialog box confirming that I want to delete the series and then I get a never ending hour glass.  I have only been sucessfull in deleting one series.

Is there a trick to deleting series?  I'd like to keep our implementation relatively clean.

Regards,

Bill