TikZ mind map problem

Hello,
The attached PDF file should open correctly in reader(acrobat) 9, but if you
close the file and then reopen it, it will be corrupted.  The file will open
correctly if you close reader(acrobat), load it again, and then open the
file. The file has no problems if I dvi > ps > distill.
I have attached the tex file.
Tom
http://old.nabble.com/file/p29873950/mindmap.pdf mindmap.pdf 
http://old.nabble.com/file/p29873950/mindmap.tex mindmap.tex 
--

-- 
View this message in context: http://old.nabble.com/TikZ-mind-map-problem-tp29873950p29873950.html
Sent from the pgf-users mailing list archive at Nabble.com.

------------------------------------------------------------------------------
Virtualization is moving to the mainstream and overtaking non-virtualized
environment for deploying applications. Does it make network security 
easier or more difficult to achieve? Read this whitepaper to separate the 
two and get a better understanding.
http://p.sf.net/sfu/hp-phase2-d2d