I've recently installed Commander One and it looks like I've found a bug.
System: MacOS Sierra 10.12.4, Commander One 1.7.2 (2317).
1. Go to MacOs System Preferences -> Keyboard -> Shortcuts -> Services. Make sure "New Terminal at Folder" under "Files and Folders" is selected.
2. In Commander One call context menu on a folder. Select Services -> New Terminal at Folder.
3. Two terminal windows are opened -> BUG, should be one.
Behaves the same if a hotkey is used.