Extortion and the UGO Network?

An Anonymous Webmaster asks: "I'm the webmaster of one of the largest websites on the UGO Network. This past month UGO gave notice to all affiliates that they say all guarantees are gone and will only make payments up to February's ad traffic at half rate. Yes they are currently 2 months behind on payments. (This includes HardOCP, ShackNews, BluesNews, VoodoExtreme, Telefragged, OldManMurray, my website and many others. UGO handed out contracts last week saying we must forfeit all our rights to previously owed money and rights to sue them to get those last 2 checks. Yes that's right, if we don't sign a paper saying we wont sue them they will withhold 2 months of payments they already owe and have available to them. Does anyone have any realistic advice for all these webmasters? A lawsuit just doesnt seem like it would really net any cash." Now this just doesn't sound fair at all. It's a shame that these big site networks aren't able to pay their sites what's owed, but is such extortion really the answer? I'm sure many webmasters may have found themselves in this position before. What did you do to resolve this kind of problem?