USB drive sdd inserted and Nemo opened
Drive sdd 'Ejected' in Nemo

Gparted's view of the drive sdd

USB drive sdd inserted and Nemo has opened

USB drive sdd inserted but "Ejected"

Before inserting the stick run udevadm monitor --udev then plug it in - you should get some activity as it detects the device.

Paste back the results. 

Also paste back sudo blkid after udevadm.

Here they are: -