Tixati is checking files whenever it wants on startup, even if the files weren't in use in days and the only apparent way to fix this is stopping the transfer being checked, which then breaks any renaming attempt since Tixati doesn't remember the files were being moved, which causes any extension you have for incomplete files to NOT be removed.
Now I am stuck with renaming hundreds of files manually and risk Tixati locking up again because moving files also have a chance to lock the transfer in a 'Waiting to move...' state.