We were also bitten by this yesterday on several delivered projects, all using custom HTML 5. The ipad's auto-updated the ONE app and now several projects are dead in the water because there are no other UIs available. We are however not using contracts, just regular joins. Question, are you sending a large amount of serial data through your contracts (anything over about 1000 characters)? Is your backend Simpl Windows or SimplSharp (S#)?