I have two problems with my setup of this contribution.
I am using 1.8.1, which used to be the latest, but I guess is now supplanted by 1.9. I don't think that the new version will fix this.
When it displays the picture, occasionally the letters are so far off the screen that it is impossible to distinguish the letter. Sometimes it can be mistaken for a different letter. I think this is probably a setting issue that I have, but I don't know how to fix it.
The other issue is that it displays weird characters like @, +, =. I would rather have it stick to displaying numbers and letters.
I have linked to an image that displays the second problem quite well. This image shows that the characters are slightly off the screen, but it is still pretty easy to tell what it should be.