Yesterday, Ovid updated its interface. In Medline there is now a "find citation" function, to help you track down incomplete references. Icons have gone, so the icons for basic and advanced search and for options like author or journal searching have been replaced by tabs. There are "find similar" and "find citing articles" functions.
I will be updating the Library's Informs online tutorials, and you will be able to use these to get a guided tour of the new interface.