With our Q3 2014 SP1 release an exception is thrown when you try to maximize an Item. 

Available in LIB version: 2015.1.1208

The RadTileView throws an exception if you initially have a maximized and selected items in databound scenario. 

Fixed in LIB version: 2014.2.1006

If you have a nested TileView and its MaximizeMode is One you'll still be able to press the Minimize button of the Maximized tile and this will lead to incorrect layout.

TileViewItems' opacity is lost after drag and drop - if you set an opacity different than 1.0 in XAML it will be overridden after a DnD operation with this item.

If a RadTileViewItem hosts several controls (e.g. Buttons, RadioButtons) users should be able to change the focused element using arrow keys.

When you replace a business item in binding scenarios the old item is not removed from the tileView.