I had the same problem, with the blank keyboard in hebrew. My solution was to copy he_IL.vkb file to /usr/share/keyboards/
to see if you are missing the arbic .vkb file, please type in xterm:
ls /usr/share/keyboards/
and press enter.

I still have a problem with my fingerboard which shows russian fonts instead of hebrew. I have converted the he_IL.vkb file to xml, but the xml file didn't come out right, so no luck. the vkb file came from the maemo "how to view hebrew" page so if someone has a newer version that would be great.