And... just as fast as it appeared... yes (you guessed it), it has cleared up. 0/o
Maybe(?) it was one of the suggestions that just took a while to percolate down the chain, maybe... well, maybe a lot of things. I feel like someone who has just fixed an "intermittent electrical problem".
THANK YOU to all who took their time to offer suggestions, help and advice, or just moral support.
Carry on...
o7