A thread in a general-discussion area here concerned unexpected behavior when 'No Break' is set for a text style via the style-editing dialog. (There might be a bug involved or it might be working as designed; I'm not sure.)
One participant mentioned not being able to find information about 'No Break' in the online help. I searched for 'break' within the help and also couldn't find 'No Break' either. It would be helpful to have this documented in future releases — especially if its use within the Character palette is intended to have an entirely different effect from what happens when you enable the setting in the style-editing dialog.