Everybody sorry for the multiple posts regarding the issue with my Naga coins. I now believe that as I used the seed words to get in MetaMask, the account Nagas were deposited was deleted for this reason. Although I have the account I gave from the Naga site, I do not have its private key, so I cannot restore it? If MetaMask does not hold my old account anymore and cannot import it either, its an odd way to loose coins... Any one can comment if this is the case?
If you still have the seed words then you should be able to restore it, the same words should create the same private key each time. You *might* be able to use the seed words in MEW instead, not sure but maybe worth a try if you run out of ideas.