Although a rather old problem (old as IE 11, actually), a couple of my clients have had experienced it lately so I decided to write a quick post on it. SharePoint does not work properly with IE 11. Period. In fact, neither 2007, 2010 or 2013 versions do. There are quite some issues with the UI, regardless of the statement in Plan browser support in SharePoint 2013 (http://technet.microsoft.com/en-us/library/cc263526.aspx).

Let’s see what’s happening. If you try to open SharePoint 2013 calendar, for instance, you will get the following output:

As you see, the calendar UI is messed up and unusable. If you try to click on month you will get the following error message:

Now, there is a number of other UI issues and they will be eventually fixed with some of the future CUs. For now, the only thing you can do is to add the site to the Compatibility View settings list. To do so, click on Tools > Compatibility View settings and add the domain to the list:

After you click Close, the page will be refreshed and the UI will work as expected: