Log-in screen is blank

Have an issue on several machines where the log-in pop-up window is blank. This is running on a school network and it does work fine on the Macs and one PC. I have tried all ways to get around this but still no luck - it's almost like the window just hangs. System details of an affected / test machine are:

Host Name: LGR-OFFICE
OS Name: Microsoft Windows 10 Pro
OS Version: 10.0.16299 N/A Build 16299
OS Manufacturer: Microsoft Corporation
OS Configuration: Member Workstation
OS Build Type: Multiprocessor Free
Original Install Date: 13/03/2018, 09:38:22
System Boot Time: 05/06/2019, 17:06:37
System Manufacturer: LENOVO
System Model: 10DU000SUK
System Type: x64-based PC
Processor(s): 1 Processor(s) Installed.
[01]: Intel64 Family 6 Model 60 Stepping 3 GenuineIntel ~2901 Mhz
BIOS Version: LENOVO FCKT72AUS, 04/08/2015
Windows Directory: C:\WINDOWS
System Directory: C:\WINDOWS\system32
Boot Device: \Device\HarddiskVolume1
System Locale: en-gb;English (United Kingdom)
Input Locale: en-gb;English (United Kingdom)
Time Zone: (UTC+00:00) Dublin, Edinburgh, Lisbon, London
Total Physical Memory: 4,009 MB
Available Physical Memory: 1,351 MB
Virtual Memory: Max Size: 4,713 MB
Virtual Memory: Available: 1,522 MB
Virtual Memory: In Use: 3,191 MB

Any ideas?

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