May sounds stupid but did you save them in the. Tax format? You may have more than one TT folder? It sounds like you had no problems opening this return as you worked on it over several days. So to me that doesn't sound like a software glitch. It was saved there previously. You can consider if your computer glitched your power flickered or was lost or if you have a malware on your computer. Do you have the TT folder in your documents still? Look inside is another Tt Folder within that? It's strange alright
You could uninstall and reinstall the software if it is a glitch in it. if those files are saved some where it will not delete files just the software.
