String modification

I am trying to use SelTextLine but am getting a lot of errors with it (no descriptive help in the help file)
On the PPC it works fairly well, however, on the PC I get jibberish from SelTextLine and it is always 3 cha long.
On the PPC it works fairly well, however, on the PC I get jibberish from SelTextLine and it is always 3 cha long.