Try This

1. Open BS and Bot
2. Click Start and on the search button search for "services" (the one with a gear logo)
3. Once in services look for "Desktop Window Manager Session Manager"
4. Right Click on it then click "stop" Right Click again and click "start"

there you have it... Background mode should work. (it works for me)

p.s. You need to do this every-time you re-open BS.