F12 USB flash drives not recognised

[Stewart Williams]

In F12 any USB flash drives I plug in are not fully recognised (i.e. I
cannot mount them)

dmesg output:

usb 1-5: new high speed USB device using ehci_hcd and address 11
usb 1-5: New USB device found, idVendor=0d7d, idProduct=0100
usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-5: Product: Flash Drive
usb 1-5: Manufacturer:
usb 1-5: SerialNumber: B7730201070A
usb 1-5: configuration #1 chosen from 1 choice

(missing sdX info, size, etc)

They used to mount on F11 and earlier without any problems. On the same
PC I can access them in Windows too, so the USB ports are OK.

I have tried them on another machine running F11 and they are recognised
an mount too.

Where do I start to look or how do I try and get them working?