Hi,
I use Windows 8.1 x64 and when I have completed a download and then I exit from program, Tixati deletes the folder "c:\downloads" and its subfolders with completed downloads.
When it deletes these subfolders, Tixati bypass "recycle bin" so You must run Recuva or similar program or download again the same torrent.
So I copy subfolders with completed downloads BEFORE exit Tixati.
But if You wait some moments (one minute) before exit program, these subfolders with completed downloads are not deleted.
This problem start with release 2.11 (and up) and it is explained inside this post:
http://forum.tixati.com/support/1439/
b.t.w.
Tixati 1.99.1 on Windows 8.1 x64 has not this problem.