If this is not a font issue, try creating your titles in Photoshop, Illustrator or After Effects as a workaround.
As Fuzzy mentions, this is likely a font issue. Titler is very sensitive to fonts, and even good fonts (not corrupt), that are not properly written, can exhibit display issues. Often, using a font from another foundry will fix the issues.
Some years back, I helped a user with her Chinese fonts. The ones that she was using were not corrupt, but none of her Adobe programs would properly display them. Often, they were just empty spaces (like one of your characters), and some displayed as empty "boxes." In the end, we found a couple of similar fonts, from a different foundry, that worked fine in the Adobe programs. She had to purchase the new fonts, and I cannot recall from whom she bought them - looked for my old e-mails, but that was just too long ago, so I no longer have that correspondence.
I would try Fuzzy's Copy/Paste suggestion first, and if that does not work, then I would search for similar Chinese fonts, from major foundries, and experiment with them.
Did you ever resolve this issue? I am having the same problem and need it resolved.
Thank you and God Bless,
Mark A. Sam
I resolved this by changing the font on the title to a Chinese sound font, like SimSun or MingLiU
I'm still not sure what caused the issue as the font I was using seems to work fine in other Adobe programs. But switching to a different Chinese font did resolve this issue, so I'd try that.
That is what I did. I was using some Arabic font.