After installing the update on my laptop the UI error has returned on Halion 6.
Halion Sonic and SE are not affected.
My laptop has Intel HD Graphics 3000, Nvidia NVS 4200M. I retried the registry fix that was applied last time but this does not correct the issue.
The previous work around is here https://helpcenter.steinberg.de/hc/en-us/articles/115000934990-User-Interface-errors-in-HALion-6-on-Windows.
The fault is present on the standalone version and when Halion 6 is used in Cubase 9.