Digitizer problems

I have been running Fitaly on my T3 for some time without problems. Lately it has started acting up. If I tap the keyboard below the middle of a letter box, the letter below is printed.

I have reset the digitizer and every other program works fine, even some with much smaller boxes than Fitaly.

I emailed support over a week ago and have not had any form of reply.

Has anyone else experienced this problem?

How do I fix it?

David