Yes, whole section. Yes, an administrator. No, I didn’t change things like that, but I installed several other plugins, which however don’t deal with roles etc. Unfortunately, I didn’t notice the very moment when the section vanished.
Krzysztof, I think one of the plugins must have changed something when it comes to capabilities.
I suggest 3 things, tested one by one.
1. Deactivate News Manager and activate it again.
2. Install user role editor to check if you have ‘publish_news’ capability.
3. Remove (or comment) line 581 in news-manager.php that’s responsible for news menu position 'menu_position' => 5,