I have recently started having problems with Transmission.
When I click on the icon on the desktop or select it from 'Applications/Internet/Transmission' it takes about 3 minutes for the GUI to show up on the desktop. When it finally shows, none of the torrents download any data, they show as 'Downloading from 0 of 0 Peers' it never actually connect to any, even when left overnight. They eventually stall.
It's nothing to do with my blocklist, which I can no longer find! I've done a full search for '.config' and there's no sign of it, which is strange as Transmission still shows the blocklist.
I have installed Transmission on a laptop with Win7 installed and it works fine so I don't know what is wrong with the one on my PC with Ubuntu 12.04LTS on...
Found '.config' by other means - accidentally found it's path in Transmissions message log.