This is definitely not lens flair. Buy a used back from KEH and you will be back in business.
You can also just repair the light seals on your film backs, it is not difficult or expensive. Kits are available on the auction site or you can make your own using the foil from the old seal and fresh foam but new is much better.
Ok I found seal kits on Ebay for the A12 backs, how hard is it to re-seal them?
Definitely the light seals. Take a look at http://www.hasselbladhistorical.eu/HT/HTSeal.aspx
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