Well, we can't know without knowing the details of your computer system.
But...make sure you are saving your file to your computer's main hard drive or SSD.
Do Not save directly to a flash drive, or a USB-connected remote drive.
(not sure what happens if saving directly to a cloud drive)
Other...if not that.
Rt-click on the TTX icon, and select "Run As Administrator." Then see what happens when saving a test file.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
