I had the nexus 4 & everything ran ok. With the nexus 5, my bluetooth ear piece couldn't be seen. Then when I tried to add music, I couldn't see any folders on the phone.
I run Win 7 Home on the desktop, the phone has updated to 6.0.
OK, problem fixed!! It wasn't the cables. Once plugged in I had to swipe down to change settings. Otherwise it was set to charge only, I have to set for file transfer (MTP) or photo transfer (PTP) or MIDI. Not sure but it might be every time I plug it in to the computer. Thanks to all that helped me with this & I hope this will help others too.