Transmission & uTorrent no longer work

Hello,

I've been using Transmission for years but last week it stopped working. Uninstalled, re-downloaded. Still didn't work.

Have tried several versions of it but none work/open.

Downloaded uTorrent, it was working fine. Now it also has stopped working.

No idea why this is happening. I'm using a Mac OS X 10.5.8


Anyone able to shed any light on this?

Cheers

http://www.transmissionbt.com/download/

Requires Mac OS X 10.6 or later