I subscribe to the ad-free uTorrent for Windows. I'm running version 184.108.40.206498 on Windows 7 Pro 64-bit. When I exit uTorrent, it hangs and will not close. Clicking on it gives the "not responding" message at the top of the window. The application cannot be closed with Task Manager, even with the "End Process" and "End Process Tree" commands. The only way to kill it is to log out or shut down the PC.
This is a new problem as of yesterday. Not sure what version I was running prior to downloading the latest, which I thought might help.