Lightroom CC Lens corrections fail

Hi everyone and anyone;

Ever since 'Classic' was launched I've been having problems adding, or rather keeping, my Lens Corrections saved to images.

I have always (since LR1 I think) had Lens corrections added on import. Suddenly, with the same user preset that I've always had, the LC don't get applied on Import.

What's going on pleeeeeeeeese! It's annoying beyond sanity. I can't get it to work. On rare occasions when it does get applied, it will be 'custom' not 'default' and probably not the lens used for the shot.

Somebody help me!