Recently when I browse the online catalog there is no "Request Item" button. I use Chrome as my browser.
We are right now in the process of moving to a new catalog system. During this time we can't process requests while we're moving our data over to the new system. We expect everything to be moved sometime tomorrow, August 31st, and then you will be able to request items once more - though the screen will look a little different!
We think you'll like the changes to the catalog. Thanks for your patience and sorry for the hassle!