I too have used TTax for many years, and I love it (insofar as I can love anything related to taxes); rarely has it given me any grief; and it takes care of a boatload of miserable details. I suspect that your computer, not TTax itself, is the primary source of your problems. It sorta sounds like it's clogged up. Have you run any kind of junk and Registry cleaner on it. There are many such applications - I use CCleaner. I believe it has a free and/or trial version.
