This might be an obvious answer, but I have been having this problem (just noticed it *and* just switched from Azureus to UTorrent to save memory) and I just now unchecked "Enable DHT" (also unchecked "Enable for New..."), applied it, checked that DHT was disabled, Rechecked the boxes, and DHT logged in immediately. Up to 220 nodes now. Not sure if its a real solution, or how long it'll last. Also feel free to delete this post if I'm throwing out stupid info. But FYI deleting my DHT.dat and Dht.dat.old files also worked (briefly), but it also made my Utorrent have to recheck every torrent I have running, which is around 50, and that took an absurd amount of time. Wanted to update that this doesn't work every time, and in fact stopped working after the first time. However, for some (probably unrelated) reason I am now showing 200+ nodes again, after being stuck at the Login for a long time.
