If you can't click buttons etc on flash videos in Ubuntu here is the fix from: http://helpforlinux.blogspot.com/2009/11/i-cannot-click-on-flash-in-ubuntu.html
I have Ubuntu 9.10 64-bit and it worked for me.
Hit ALT+F2 and enter the below line
gksudo gedit /usr/lib/nspluginwrapper/i386/linux/npviewer
Add the following line BEFORE the last line of text
Restart any applications using flash
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