I had the same problem. My solution: (ACAD 2010) Go to Tools menu pull down and select 'options'. Then select the tab "DISPLAY" and on that page look for the options listed under 'Display Performance' section. Select by checking the box next to the "Apply Solid Fill" option. Hit "Apply" (bottom of menu page) and close menu. Use command: Regen and there it was the Arrow was filled again in Paperspace.
------Good Luck from the Crowman.
*John Crocco wrote:
We are new at getting into using paper space. Why do arrow heads that show
on the drawing as solid, and plotting in model space plots them solid, but
plotting them in paper space they are not filled?
AutoCad 2005 in XP PRO