Peerless is right about the time business, but your problem sounds like something changed with your ports. Then again,maybe there are enough ultrapeers available that the networking code thinks your machine will work best as a leaf.

However, check the options -> bug reports to see if it still says "Accept incoming =True." Your LW really needs to be able to accept incoming connection attempts to operate as an Ultrapeer.

If it says false, then the incoming port is blocked (router? firewall?).

(btw--you don't need to quit and restart for most of the changes to work: just using disconnect and connect should be enough to reset connections).