Problem now is I have no access to the old account and still have no idea why.
Is it possible you were trying to login with the wrong wallet ID? Did you assign an alias to it? If not, did you have an e-mail or SMS assigned to it which might give you the wallet identifier?
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https://blockchain.info/wallet/forgot-identifierI log into my new account and the balance is zero... WTF? I thought transfers could not be reversed?
Confirmed transactions cannot be reversed. If the transaction was being ignored (or not being relayed) and never made it into a block, eventually the rest of the network will forget about it and the original client will need to re-broadcast it. Blockchain.info is simply saying it no longer broadcasts it.
why would blockchain show a full balance for so many days in the new address then revert it?
Blockchain.info/wallet includes in your balance any transactions that have not yet confirmed.
Is it possible that the transaction from the "lost" wallet itself too had not confirmed? That might happen if the party that sent those funds to you had double spent against you. If you know the bitcoin address(es) in that "lost wallet", check blockchain.info to see if that address(es) till show the funds. If not, then you have a different problem than not being able to login to the "lost" wallet.
[Edit: In the worst case scenario, blockchain.info (or someone else) might have an archive of the transactions. If your transaction is valid and just needed to be rebroadcast, anyone can re-broadcast it. If it instead simply didn't get relayed for whatever reason, and nobody has a copy of it, then you're out of luck.]