Orca Screen reader won't read anything, but it talks when it opens

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http://askubuntu.com – Orca screen reader isn't reading anything on the screen. I've been trying all the commands like insert + + and insert+/. How does this work? None of the documentation seems to indicate how to use this. I'm using Linuxmint 13 Mate, which is like Gnome 2 on Ubuntu 12.04. (HowTos)