3D view and thumbnails not showing

I was looking at some of my models checking on one problem and I find another…sigh…

(I would have put this in issues and bugs but as I can’t upload screenshots to best show the issue, I’ve put it here).

It seems to be an intermittent problem.
Sometimes the 3D view loads sometimes not.
Sometimes the thumbnails loads, sometimes not.
Sometimes it’s a mixture !
And when it does load, for example, the, Modern designer leather handbag, it won’t display the thumbnail at all. When I try to save the thumbnail in edit, it won’t let me save it! Not that I should have to as it’s clearly showing as already there.

See screen shots.


.

.

.

.

.

I’m not going to send this problem to support
I don’t want to deal with the long winded back and forth of trying to solve the problem. So instead I’ll let you know in this post…in the meantime, I’ll live with it!