We are currently experiencing a problem using Internet Explorer to search Summon.
This appears to be due to an update to the software from the supplier (Ex Libris) and we are currently waiting for the company’s support team to resolve the problem.
Please accept our apologies for the inconvenience this is causing.
Until this is fully resolved, the workaround is to use an alternative web browser such as Chrome, Safari, Firefox or Opera.
Update: 17 Sep 2018
This has now been fully resolved by Ex Libris.