Ah... I think I've found it. The italic font was correctly defined as italic, but it had the slant as 0. I clicked the "Guess" button (it changed to -12 or so) and saved as a new OTF file. Now the default font is the regular one.
But the font doesn't look so nice, the characters' height looks uneven, probably due to the limited screen resolution, or bad hinting/antialiasing.
(Or it could be the fact that I changed "Normal" to "Regular" in the weights.)
Last edited by Jellby; 05-04-2012 at 12:05 PM.