Deluge
After hitting 'Clear' the the torrent list has stopped its timed updating.. there are no list and column updates unless I force them by for example moving one of the torrents up or down. Till now this just happened once but I thought it would still be worth reporting it.
Also UPnP doesn't seem to work. It's enabled but my network router doesn't open any ports by UPnP.. It does when using Azureus or µTorrent but it doesn't when using Deluge.