Hello,
I had the same problem with 4.5.0. I just saw that 4.5.1 was released, so I tried it, but sadly it has exactly the same problem
I am not sure if it's caused byt one specific torrent in particular or not, I might try removing them all in 4.4.5 and adding them one by one in 4.5.1.
One thing that could be the issue is that I download files to local PC and a network NAS, so maybe it can't handle a network (local network path using a name, not an IP address) device?
Edit: I just noticed
viewtopic.php?t=3505 I will check GitHub when I get home.