This might not be specific to CND.

Up until a few months ago navigating to declaration/definition would adjust the edit viewport so that you could easily see the declaration. Then a few months back it changed so that it would still adjust the viewport, but the declaration might be one line above the viewport or one line below. It was irritating, but close enough.  This was as recent as build 20161111.

Now with the build below, sometimes it does not adjust the viewport at all.

In my environment, I can repeat as follows:
- set up the ide with at least two edit panes, A and B.
- find a member function F implementation in pane A that is referenced by code in a different file that is viewable in pane B
- place the cursor position in pane A so that the member function is out of view in pane A (if you only scroll, but don't move the cursor, the error does not occur).
- go back to pane B to the function reference and right click and select 'navigate to declaration/definition'.

The current pane will shift from B to A and the current cursor position will move to the definition of the function, but the viewport will not be adjusted. If you then hit up, down, left or right, the viewport will snap to the right position.

Product Version: NetBeans IDE Dev (Build 201611240001)
Java: 1.8.0_45; Java HotSpot(TM) 64-Bit Server VM 25.45-b02
Runtime: Java(TM) SE Runtime Environment 1.8.0_45-b14
System: Linux version 4.1.13-100.fc21.x86_64 running on amd64; UTF-8; en_US (nb)
User directory: /home/toddb/.netbeans/dev
Cache directory: /home/toddb/.cache/netbeans/dev