Good afternoon. I have exactly the same problem. I can not exchange BCH to BTC in wallet blockchain.info and I can not send this asset to any other purse. I wrote to the support service, there is no answer yet. Can someone tell me, is there a technical support for this wallet on the forum or who had a problem like that? I did not use the recovery through the seed yet, I think this is the last thing that can be done, but I will wait for the answer.