Do you experience problems during downloading?
Check your connection in Status and Interface settings window.
Use Test Server in Config > Servers.
We will probably ask you to do a test using only basic settings.
Do you experience problems during repair or unpacking?
Enable +Debug logging in the Status and Interface settings window and share the relevant parts of the log here using [ code ] sections.
It happens when you drag something on the screen, normally when you drag-and-drop a bunch of NZB files that you want to add.
But sometimes also when you drag something else it can show up, because we don't know what you're dragging until you let go of the mouse.
Especially Firefox triggers the drag-and-drop event very quickly and forgets to tell SAB when it's done.
Anyway: next time you can just refresh the browser window if the Plus stays.
If you like our support, check our special newsserver deal or donate at: https://sabnzbd.org/donate
Ahh, well, I never adding anything like that (didn't even know that was possible), though, shouldn't there be a 'cancel' button someplace?
Right now, I just scan a directory, and it adds it from that.
Forgot to mention I was using FireFox 49.