Look the attach file,when resize the GanttView  column （left or right） reciprocation,the colum resize line is not align to the grid column line.
just when the DPI is exceed 100%, Appears.

This reproduces with recurring tasks.

Scheduled for:
The fix for this issue will be available with LIB (version 2019.1.128) scheduled for publishing on Monday, 28th January 2019.
 

This reproduces with recurring tasks.

Scheduled for:
The fix for this issue will be available with LIB (version 2019.1.128) scheduled for publishing on Monday, 28th January 2019.

The selection shown in the exported image is wrong in some cases. This is reproducible when you select multiple items (more than 2).

To work this around you can clear the selection before the export and then re-select the items. To do this you can use the SelectedItems collection of the RadGanttView control.

If you have a GanttTask(s) added in the RadGanttView control, and the DPI is higher than 100%, the UI is almost unresponsive. Also, the newly added tasks are not visible until you resize the control.

When the Window OS DPI setting is set above 100% resizing the grid portion's columns with their resizer controls leads to unresponsive UI and possible application crash.

The issue is only reproduced if the InitialExpandBehavior is set to Collapsed.

Available in LIB version 2016.3.1017, it will be also available in the 2016 R3 SP1 release.

Available in LIB version 2015.3.1123, it will be also available in the 2016 Q1 release.

There are two scenarios where the issue can be seen:

 - at startup when the ColumnDefinition’s Width is set to AutoHeaderAndContent its Width is rendered incorrectly;

- when you change the PixelLenght;

The issue could be observed in the attached short video

When collapsing the parent task first and then the child tasks a System.OverflowException is thrown.

Available in LIB version 2016.3.1017, it will be also available in the 2016 R3 SP1 release. 

When adding new tasks the control does not update his ExtentHeight and ExtentWidth.

When removing Tasks that are not visible (the parent task is collapsed) an ArgumentOutOfRangeException is thrown.