I had several downloads started at various stages of completion. I have the scheduler set to run and stop the torrents every morning. It's been working fine for weeks. I get up each morning to check their progress and then at night I start Tixati to run every evening.
   This evening I started Tixati only to find every torrent that was downloading the night before, and that I checked this morning before shutting down the program, are gone. The folders are in my download directory but the files are incomplete. The torrents do not show up within the completed pane nor the downloads pane.
   The only words that come to mind are, what happened? It's bizarre.

I get this problem as well: I'd start a torrent, and when I start up my computer later I'd find the incomplete file downloaded, but not listed in the client. I've noticed this issue a few times in maybe the past 2, 3 months.

I'm using the 2.12 version from the AUR, by the way.

The same problem with 2.16,on windows 10

Transfer pane -> Layout -> Categories -> Sidebar
Be sure you select ALL or something downloading. The Ctrl-click of STATUS is a UNION (all of the included). Whereas clicking categories made by the user are an INTERSECT