second monitor Odyssey G40B not working since win 11 25H2

I have two monitors Odyssey G40B which are connected to both my work and home PCs. They worked without problem until my home PC was upgraded to windows 11 25H2. At which point the home PC failed to detect the second identical monitor. The work PC is still at Win 11 24H2 and both monitors work fine. I've changed the monitors around and changed the cables and ports but the home PC will only recognise one monitor whereas the work PC displays on both.

I've tried updating the drivers on windows 11 home PC. Deleting and reinstalling the display adapters and installing windows 11 25H2 on the home PC to no effect. I've now missed the 10 window to easily rollback 25H2. Has anyone else seen this issue or have any suggestions?

Regards Simon