I have the same problem here in the same legal PS9 version.
But I use the youtube option only to make a MP4 file of the show
So now i use the Vimeo or memory stick option for my MP4 file..
( save video to my computer )
I think the solution is a perfect and complete clean of PS from your computer
and re-install all the PS files.
( you need a copy of PS9, extra's and serials )
For me to much work, when i can solve the problem as discribed above.
see the discussion about REVO uninstaller :http://www.proshowenthusiasts.com/viewtopic.php?f=10&t=24368&p=179197#p179190
greetings from Uk, Holland