1. What OS? (Wheezy or Jessie)
2. What class/size SD card? (ex. class 10 16gb)
3. What Model Pi? (A+, A, B+, B, Pi2)
4. Please describe the bug / issue. Attaching any relevant screenshots would be very helpful! Thanks in advance.
Added 2 temp sensors (DS18B20) with the Pi turned off then powered it on but they did not show up in the dashboard. Should have did some more troubleshooting but I instinctively removed the Pi and re-added it and they showed up. Not sure what to tell you other than install Cayenne with the temp sensors removed then shut down the pi and hook them up and start up the Pi.