Most Hebrew fonts only contain Hebrew glyphs. Since the font menu in the object
bar attmpts to render font names in the actauly fonts, all those fonts display
as blank entreis (although the fonts themselves work).

To repro:
1) make sure you have some Hebrew fonts installed that do not have English
glyphs. like thge free fonts found here:
http://www.kitsh.co.il/bensfonts/index.html
or the commercial fonts from Masterfont.
2) Try to select one of them from the main font menu- they appear as blank
entries in the menu.
3) after selecting one, notice how the font itself works for Hebrew text fine.
Notice that in the widget above the menu, the font names appear fine, but in the
recently used font list on the top of the menu the name renders blank.
4) right click on the document, and select the font context menu. Notice that
the font names are in the application font, and they are appear in place.