Workaround:

Define an implicit Style targeting GridViewRow UI element under Window.Resources or RadGridView.Resources section.

The issue is reproducible with Q1 2015 SP1 version. With Q1 2015 it is not.
In order to reproduce it, add at least one empty cell. When you try opening the excel file you get the an error that Excel will try to recover the file.

Should be resolved with LIB version 2015.1.413.

* Workaround: commit the edit before removing the item
* Works fine with the old Nested mode

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