newbie question

[Timothy Shey]

I've actually been using Omnigraffle for a while, but just upgraded  
to Omnigraffle Pro 4.1.   For some reason, a relatively simple  
website layout diagram I did is exporting to PDF at over 14 MB.    
Can't think what could be causing it-- I've turned off gradients,  
removed images, etc., but none of those have had any effect on file  
size --  the resulting PDF (and also Visio XML exports) is still the  
same size.  Anyone know any common causes of this I could look for?