If you are having issues logging into WorldCat Discovery, the root cause is in most cases related to your browser's cache. To test whether this is the case, the first thing you should try is to open a private window (in Chrome, File-> New Incognito Window; in Firefox, File->New private window) and then attempt to log in again.
If doing so results in a successful login, you might consider clearing your cache, which should resolve the issue (here are instructions for Chrome and Firefox).
If the problem persists, please contact a librarian for further assistance.
