The Scroll Lock state switches from 'on' to 'off' when any key is pressed inside the NoMachine session.

This problem has been reproduced in the following environment:

NoMachine client v. 6.0.78 on Linux (Linux Mint 18.3 and Fedora 27)
NoMachine server v. 6.0.80 on Windows 10.

Steps to reproduce:

1. Connection by NoMachine from Linux to Windows.

2. Press Scroll Lock on either the Linux machine or the Windows machine to enable the Scroll Lock state on the Windows machine.

Note: when Scroll Lock is enabled, moving the cursor to scroll down a text window is blocked and the arrow keys should be used instead.

3. Press any key on the user's keyboard while the NoMachine client window has focus: the Scroll Lock state switches back to 'off' on the Windows machine, while it should stay 'on'.