Right now im running the iPhone 4 with iOS 5.0.1 on sprint, and i jailbroke it. Cydia has been working fine until last night, when ZodTTD and ModMyI's packages stoped working. They say that the signature is invalid. I deleted the sources, and tried adding ModMyI again, and it says URL not found, and then a bunch of errors, and adds it but you cant find anything under that source. Anyone have a solution or the same problem?