Problems with clicking on Flash buttons in Ubuntu 9.10 with compiz

WORKAROUND 1: Disable compiz
WORKAROUND 2: Remove flashplugin-nonfree / flashplugin-installer and install from adobe
WORKAROUND 3: Open a terminal and enter:
gksudo gedit /usr/lib/nspluginwrapper/i386/linux/npviewer
Then add: export GDK_NATIVE_WINDOWS=1 before the last line of text.

Third workaround worked better for me.