You will find a few examples from people out there having trouble with fonts that just aren’t being recognised/rendered properly in Adobe Illustrator (I’m running CS5). The thing is, the font shows up in Illustrator and appears to be there for you to select it for use. However when you do select it, you either encounter square boxes with a big ‘X’ inside of them, or the font you’re attempting to select flickers and your text reverts back to a standard font such as Myriad.
I had this problem with a font in another language: “Mangal” or “Hindi”. After a bit of looking around and some experimentation, I found a way around it that has worked for me. Basically, I run the font through an online font conversion tool such as this one, convert it to it’s original format (for me that was .TFF) and then install that font the same way you would any other font in Windows. Voilà. I can now select the font just fine in Illustrator, paste in the text information I wanted to display and everything works pretty well.