[Ian Catalyst]

I have a problem when following the digits man 1 tutorial. I do everything as explained but when I change the size of the text to 14 and copy and paste, when i get past half way down the composition text box, the whole of the text dissapears. I have tried it on various larger font sizes e.g 28, 50 etc and it works fine.I have tried changing the size of the comp to 500×500 and it works at font size 14. what is the problem any ideas?