Now I am working NWC 2.51.
When I want to set a Force System Break, in the former versions I pressed "B" and checked the box "Force System Break".
In the current version I can not press "B" to get the same option. But the menu "Insert" - "Bar Line (Decorated)" displays the "B" at the right side, while "B" doesn't display the same screen...
Is that a minor bug?
No. Pressing 'B' allows you to insert a decorated bar line. In NWC 2.51 this is done by opening 'Selector 6'. See the Keyboard Guide (http://ntworthy.com/nwc2/help/HELP_ONKEYBOARD.htm) for the other keys that now use selectors.
In NWC 2.51, you can modify the properties of the bar line, or you can insert a system break. See: Boundary Change Properties (http://ntworthy.com/nwc2/help/TAB_NTNPROPSIZER.htm)
You can get the old Insert Bar Line window, with the Force System Break checkbox, just by pressing {Shift} and {B} at the same time.