A new mirror, better technique, and some extra patience have paid off, and
here,
FINALLY, is a screenshot of the rarer than hen's teeth "FTM blue theme" with which this episode began! (The title of the topmost "Last Post" is rather ironic.)
The blue cast subtly affects whatever screen I'm looking at, but, of sites
I visit and apps
I run, can be seen distinctly only in an FTM screen. (I use the ubbthreads_finetunedmac theme.)
Maybe I can now get the "Geniuses" to do the job right?
Edit: Well... I thought it was captured, but even Photo Booth couldn't turn the trick (and damned if I understand why); as soon as I restarted my deuced Mac(hina) the blue disappeared from my screen and the uploaded image.
I'd swear that the Photo Booth window didn't shown the blue even when I thought I had it captured, but I wrote that off as a trick of the light.
(And
NO... I absolutely do
NOT do hallucinogenics!!!)
This is insanely frustrating!!!