I found one thing that works for me, and no need to delete the .ini file (and thereby lose a few settings). This worked for me, no guarantees, YMMV, yadda blah blah etc..

Open up preferences, click on "Connect". Make sure "When in Ultrapeer mode" are both checked and have a valid number for them (any number), and "Apply" - should have immediate results. Doesn't matter if you have "Able to become Ultrapeer" checked in "Network" or not. (I leave it as not, since there seem to be more ultrapeers than anything else, and they suck as connections too)