There's a problem that I seem to be getting relatively often right now that the ladder search gets stuck. Sometimes when I finish a match and go to search again I see the text at the bottom of the client saying there is someone in my rating range looking for a match. So I click the button and nothing happens. The text never goes away and I don't find a match.
The only solution I've found so far is that I have to restart the client for it to work again. Don't know if the log will be helpful but I'm adding it anyway.