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Insertion of USB devices not being recognised.

As per subject, after the last image upgrade, the computer doesn't
recognise when a USB device is plugged into a USB socket.
what is the problem?

System is Debian Stretch V9.4
dragonfly 4.9.0-6-amd64 #1 SMP Debian
4.9.88-1+deb9u1 (2018-05-07) x86_64 GNU

Rebooting with the device plugged in does not "locate" the device.
I've used fuser and lsof on both device and directories where the
devices are normally mounted to no benefit.

The only USB devices that are recognised are keyboard, mouse and raid
array on USB3.0.