I'm not on the latest beta, by the way. I'm on build number 46096.
Interestingly, I noticed that my uTorrent.exe file wasn't updating when I downloaded updates. Instead, the updates are going into a subfolder:
C:\Users\MYPROFILENAME\AppData\Roaming\uTorrent\updates
I had to copy a file called 3.5.5_46096.exe to the main uTorrent folder, delete the other uTorrent.exe file and rename 3.5.5_46096.exe to uTorrent.exe
Having done so, all is now well.