problem with displaying subtitles in italics

I don't understand, what the problem might be. In my subtitles(.sub) there are these microDVD tags {y:i} which should make a line show in italics on screen, but instead i see "a box" and yi? and no italics. Well it worked fine with my old player. Could anyone tell me, what am i missing here?

Any kind of help would be appreciated!