Hello,
Sorry to hear you are having trouble.
Since you opened an instance of the app (a text file for example) that had a command-line entry to a specific file, it opens that file again with the + button. This was not always the behavior but it is now.
I have requested a new feature that would get around it, like a Ctrl + Click of the + icon to open a blank instance.
Internal ref: ODNT-2305
Thank you for the feedback.
Sean Drohan
Stardock Support Manager