we are having the same issue, i cannot login into our account since beginning of january. but that has nthg to do with 2006 applicants, my husband already got the visa but we got married afterwards and i was added before he landed, the ecas got back to in process late september and suddenly beginning of january we got the same message on ecas, we cannot access though we are using the correct information.
we contacted our cic in warsaw, and they replied after two weeks saying that background check is still going on (regarding me). so i do not think it is related to the cancellation or retrieval of the files
PS: My husband's application is back to 2007.