06-13-2020, 10:58 PM 
	
	
	
		After making this post and continuing to use Gimp (and changing the opacity in the dialogue from 0.0 to 100.0 each time I used Layer | New Layer and it continuing to revert back to 0.0 after each time) after about four or five uses of Layer | New Layer the opacity setting then 'stuck' at 100.0 and has remained there ever since - for many uses of Layer | New Layer - (?!?)
So a 'CCBFM' (Came Clear By F*ing Magic) event
 
Anyway, many thanks to rich2005 and to Ofnuts for your suggestions - I have made a note of them so as to have some options to explore if the behaviour recurs.
	
	
	
So a 'CCBFM' (Came Clear By F*ing Magic) event
 Anyway, many thanks to rich2005 and to Ofnuts for your suggestions - I have made a note of them so as to have some options to explore if the behaviour recurs.
