I did the Onyx thing, but doesn’t seem to have done anything - tanks for asking! I solved the phasing issue - when I went back to Mavericks I needed to re authorise a lot of plugins. In my drum buss has the PSP Noble Q in it, I reauthorised the PSP and it all came back into phase. Hurrraahhhhh!
My only problem now is it takes about a fortnight to save a song - I’ll have to crack that one soon, it’s driving me mad - I’ve never had a problem like this ever and I’ve used Nuendo since it was Pro 24 on the Atari 1040!!