Web of Science will be upgraded this Sunday.  This will affect all areas of Web of Science and involve intermittent downtime between Sunday July 13th at 14:00 BST until Monday July 14th at 02:00 BST.

This upgrade includes personalisation of number of search fields on Basic Search, linked Hot Papers and Highly Cited Papers badges, a Medline update, improved Google Scholar linking, improved JCR category display and persistent sort order during a session.

Release notes explaining the changes in detail are at http://wokinfo.com/media/pdf/wok_5_14_releasenotes.pdf