@dfort
Daniel I owe you a beer

That did the trick

I really do need to spend some time and get a compile environment up and running on my Win 10 Laptop. I did try a few months ago, but got myself confused as to how to tap into the various builds, despite pointers from the experts.
As for the 113 vs 123 nighties. I appreciate that 123 has two 'features' that draw users to it, ie F/8 AF for still photographers, and HDMI out a dual monitors for videographers; but it would be good if we could ask the gurus to keep these two 5D3 power houses in step, ie always synced (as far as possible).
I know I'm asking a lot: and I'll say no more.
As for this ML user, I'm now very happy: Lua fix (well enough), F/8 AF, all my scripts working and Bulb_ND

Happy New Year to all the ML community. I truly hope 2017 will take us to new heights.
Cheers
Garry