Hello Friend; tried everything ... including this one you described me as I had noticed that too in the library ...
if I put in the program:

menu:
PrintStr 0.1, "Hi!"
PrintStr 0.2, "HELLO!"

and the display is only "oa"

I'm trying another way of writing, is half complicated (the example of nokv10 - http://www.picbasic.co.uk/forum/showthread.php?t=11640) and achieve something ... the truth, it seems weird this problem. Cheers