Admin password required, but I never set it up
I tried to open a DB file I've been creating and it required an admin password. I never turned this feature on. Previously, the file just opened without the UID/Password login. I recovered the file, no errors detected, still the same. I also tried to open previous backups (from TimeMachine) and I have to go back five days to get to one that will open. But I lose a lot of work.
Is there any way to work around this? Does anybody know how this could have happened, so I can prevent it from happening again. I know it sounds improbable, but I did not do it myself.