I've not seen that one yet.
Does it occur when you open the title window, when you start typing a title, when you change the font? Are you able to open other titles?
The issue is sporadic. I cannot find a consistent pattern. I was able to create a title, and then it seemed that after creating a second title (new sequence, same project) the issue appeared while typing the text. But it happened again while attempting to open a title (maybe it was already faulty, but it saved). Sometimes you can blow right through the error, but I've also been getting some of this: