@eilamar
Hard to know exactly...but
1) Work yourself out to the main menu, if you can...then save your file and close down the desktop software completely.
2) Reboot your computer.
3) Then restart TTX and check for any TTX software updates before you continue working on your file.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*