It appears that some programmes that require floating point graphics rendering are locking – xlib-lock – these programmes being gCAD3D and Blender. I am unable to find the cause and am unable to regress to an earlier save due to the losses I reported on my external HD. I am considering restarting again as ealier iso versions of Ultimate and PuppyTLC do not have this issue! I have desperately avoided restarting as, frankly, is very disheartening.
But the cause is bigger and more urgent than my sooks! With all the current work done this process should take no longer than a week to get to where I am now (maybe a bit longer – I would like to enjoy my xmas). I will also purchase a new external HD that will solely be used as a backup.