This is just insane!
As many members have posted, I too had this magical experience.
I install D7RC with no problems. I migrated 1,400 members over and all of their data, and the site was able to run live for 2 days without problems.
Suddenly, this afternoon - all the passwords somehow got changed and nobody, including the Admin (me) can log in.
Using "forgot my password" sends me a new password, but it will not allow me to log in with that either.
This is a bug that needs immediate attention . . . I can not imagine a site running live like this.
Sure, I can re-migrate all of the profiles but members will be PISSED that they have to redo all of their recent changes each time.
How do I (we) stop this from happening?
Why does it run fine for a few days and then suddenly POOF without warning, change all of the passwords?