CC_User

When I exit Opera 9.5 I often have many tabs open. At next startup Opera will open these sites up again. After running the latest CCleaner, Opera opened with no tabs at all. I lost many hours of Internet research. Does anyone know if I can get these back? Also a suggestion. I don't think this should be default behavior, as I was unaware this would happen, and I suspect many new users would also not expect it. Thanks for any help.