Third - Yesterday I had a colleague send a large amount of coins to the exchange with the custom wallet I had to make for him because the one made by the dev cannot open old wallets (see above) and they were never confirmed despite showing up on the then functional block explorer. However, I was able to send a small amount of coins (1000) to the exchange from the same wallet afterwards, and they *were* confirmed by the exchange.
Same happened to me ---- the problem is on CoinExchange.io 's end. They are upgrading the wallet, so the transaction will show as confirmed in your wallet and on the block explorer but will not appear on CoinExchange at all until they take their ECC wallet out of maintenance mode.