Diagnosing Arabic font rendering problem

I have an application that is localized into Arabic. On three machines I have access to to test on (Windows Vista, OS X, and Fedora 9), when the locale is set to Arabic, the UI is rendered correctly - menus, buttons, etc. all have their text rendered in Arabic and look fine.
The person that translated the text into Arabic, however, doesn't have the same results. He's running Linux (can't remember what flavor) and when he runs the application, the Arabic text all comes out as boxes. He says this is the case for any LookandFeel he tries (Metal that hideous GTK, Nimbus).
Since I can verify that the application does look okay on some machines, I feel comfortable in thinking that it's an issue on his specific machine. My question is - how can we diagnose what the problem actually is?
His machine's default locale is Arabic, and other (non-Java) applications render Arabic text fine.
He's using Sun Java 1.6 (not sure what minor release though), not GNU Java.
(Possibly?) relevant info:
I noticed that several UI keys such as "Menu.font" and "Button.font" are using a Deja Vu font on my Vista system when rendering Arabic. He says his system does have Deja Vu fonts installed, but when he's getting his boxes displayed, it seems these properties are set to some other Bitstream Vera font.

Sorry, I haven't a clue regarding a possible solution, but I thought I'd share this:
BoBear2681 wrote:
I noticed that several UI keys such as "Menu.font" and "Button.font" are using a Deja Vu font on my Vista system when rendering Arabic. He says his system does have Deja Vu fonts installed, but when he's getting his boxes displayed, it seems these properties are set to some other Bitstream Vera font.According to [this page|http://linux.wareseeker.com/Desktop-Environment/dejavu-fonts-2.19.zip/314962]
The DejaVu fonts are a font family based on the Bitstream Vera Fonts
db

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