Application will not launch after crash or force quit

I have an App (Transmission) which won't launch after it hangs and I force quit. It won't launch from the Dock or applications folder. A reboot will resolve the problem but I have another long running process which I don't want to interrupt. Is there some way to get it to launch without rebooting? Transmission is not listed as a running process in Activity monitor or ps -ef | grep -i transmission