When entering a closure, please ensure that your dates are entered in the correct format (MM/DD/YYYY). you can ensure this is correct by choosing them from the calendar instead of entering them manually.
If this does not resolve the issue, please also try clearing your browser's cache and cookies or testing in a private browser window. If none of these steps resolve the issue, please contact OCLC Support with your OCLC Symbol and the troubleshooting steps you've tried so far.