Apparently Danny Hayes helped LP negotiate their 2002 contract with WB, and also to re-negotiate their contract in 2006. He told LP that the new contract improved their royalties, which led to the agreement being reached.
Then in 2009 LP hired someone else, Paul Hutchinson, to audit their royalties, I would assume to make sure that everything was as it should be. Apparently it turned out that when they signed in 2006, they were receiving less royalties from digital sales than they were before, despite WB and Hayes claiming their contract would give them MORE royalties from digital sales, not less. So the conclusion was reached that Hayes lied to Linkin Park in order to get them to sign their 2006 contract, which ended the WB/LP conflict, and Hutchinson discovered it.
The band fired Hayes, so Hayes decided to sue Hutchinson over his evaluation. He claims basically that Hutchinson intentionally caused conflict between Linkin Park and Hayes, and that Hutchinson lied to LP in order to harm Hayes' reputation and damage his credibility. Hutchinson tried to have the lawsuit dismissed by claiming the evaluation he gave LP was made in anticipation of legal action being taken. However, this claim was dismissed, so the lawsuit will proceed.
If I'm wrong...sorry. I'm sure Astat or Mark will correct me. From what I can see, that's how it looks in simple terms though.