Authorization of a computer not working and I've tried all the options that seem to be available.

Every single time I try to play a song that "is not authorized" it still asks me to authorize the computer. When I do it says that the computer was authorized, has been reauthorized, is only one of five authorized computers, and still won't play. How is it that some songs on an album are authorized and other are not? Been using iTunes for years and never had this problem until the last month. Note I've tried resetting the account settings, deleting the sc folder - seemingly everything I can find online about this issue.