Last week we ran a process to clean up old mystery record from the database to improve game performance. It appears that there was a bug in this process that caused some stored case files to be corrupted.
This primarily affected case files stored in apartments, but it appears to have damaged some agency files as well.
Unfortunately, it is not possible to recover the lost data at this point, without reverting game progress made over the last few days. I think the downside of doing that would not be worth a full rollback in this situation.
So, I'm sorry, but if you are unable to open or play some of your stored case files, I'm afraid you will have to quit those cases. I don't think there is a very good way to compensate for the lost files, but if you are concerned about the quits going on your record, send me a sleuthmail message, letting me know how many case files you were forced to quit due to this bug, and I'll remove those from your record.
We'll improve the cleanup process to better protect case file records before the next time we run it.