Deluge
I've noticed an increasing problem which I expect is related to number of torrents? I have roughly 3000 completed torrents in a Paused state, since there is no archival function.
The UI is unable to properly and consistently sort the available torrents when trying to view a default group.
ie: selecting States: All should show ALL available torrents? But instead, the UI hops and skips repeatedly sorting and resorting and shows only Paused torrents, no Active torrents. It does the same selecting Active or Queued torrents - it will cycle from Paused to Active torrents over and over again. Sorting by sequence or dates does not affect viewing.