Well, this happened again recently. When I just access the RecentChanges page, I found some vandals and hit the [rollback] button, it went into "Permissions errors"
- You do not have permission to quickly rollback the edits of the last user who edited a particular page, for the following reason:
- There seems to be a problem with your login session; this action has been canceled as a precaution against session hijacking. Go back to the previous page, reload that page and then try again.
No matter I reload or log out, it remain the same.