The sort index will not be displayed when applying a custom sorting without adding a SortDescriptor, You can consider implementing Custom Sorting using the IComparable interface instead. As an example please refer to the Custom Sorting with IComparable WPF Demo. Using a generic SortDescriptor would also be an option. 
Please check our online documentation for a further reference: http://docs.telerik.com/devtools/wpf/controls/radgridview/sorting/custom

Focus stops moving but selection keeps moving when navigating through the keyboard down key. When the window is stretched so that the ScrollBar is not visible, the issue could not be reproduced.

 Introducing an overload of ExportAsync that exposes some "export finished callback" that could be a custom Action delegate. 

When a predefined RowTemplate is set with RowStyle property the Adding New Item functionality fails. As a workaround we suggest extracting a Style based on our GridViewRowStyle and targeting the GridViewRow.

Available in LIB version 2016.3.1212, it will be also available in the 2017 R1 release.

Clicking outside the dialog should hide it.

When TabStopMode is set to "Skip" on all columns and you press Tab, RadGridView scrolls a little.

Workaround: define a custom KeyboardCommandProvider and clear the pending commands.

gridviewdatacolumn distinct filter does not respect culture when displaying dates.

All the other display do display the correct format

Especiall for wide lists it would be very helpful to be able to zoom in and out of a RadGridView, in order to see more or less columns. 

Also see: http://www.telerik.com/forums/scaling-of-radgridview-content