Bert,
The Driver Sigining is not related to this.
Do I need to redo the whole sequence again?
I don't know about "again". Unless this is your implied answer to my question you quoted (read : I still don't have the answer, really).
But you must apply that procedure and when you did that one time, it is sufficient for "ever".
But, do notice that it would be an easy mistake to copy back from a backup "copy" of the OS, and forget about this. Also, you can take it for granted that this was not yet done in your RAM-OS Disk, because the functionality emerged later, in 2.07.
The Driver Signing and Stable options were set correctly with the previous XX version (2.04 I believe).
Which makes that impossible.
Also notice that this is about OS settings and not XXHighEnd settings or dynamically by XXHighEnd changed settings. You must really press those buttons ("Change") before something is applied to the OS and which comes through after a reboot.
Peter