Hello Edje,
If you have installed the software at your neighbor's house under the same serial number, that could cause a problem, as only one installation can be allowed for a single serial number.
However, for the display issue you have, one thing to try is this:
It might be a case of the "cache" folders becoming corrupt. You can delete the Nero Video "Cache" folders, and they will be re-initiated when Nero Video starts up again.
Where to do the deleting:
Substitute your windows username for "YOUR USER NAME" below ...
For Nero 2017 :
(1)
Delete the folder "Nero Vision" at
C:\users\YOUR USER NAME\AppData\Local\Nero\Nero 2017
(2)
Delete the folder "SharedMediaData" at
C:\users\YOUR USER NAME\AppData\Local\Nero
(3)
Delete the folder "Nero Vision" at
C:\users\YOUR USER NAME\AppData\Roaming\Nero\Nero 2017
Note: The above folders are usually "hidden" folders in Windows, so you might have to use the "View" Tab in Windows File Explorer to show hidden files from C:\users\YOUR USER NAME
and below.
If that does not fix it, it could be an issue with your .net installation, or possibly C++ runtime libraries.
You could try filling in the contact form for Tech support
e.g.
Technical support (Requires a serial number):
http://www.nero.com/eng/support/conta...