Is there a problem on bc.info's explorer?
Yes, blockchain.info won't display unconfirmed transactions from the current Bitcoin Core release. It's a known issue, caused by the new fee-sniping protection.
See
Peter Todd's comment where he says:
My testing turned up only blockchain.info and Bitcoin Core itself as having issues with nLockTime at the limit transactions; hopefully by the time v0.12 is released these wallets will all be fixed
I reported the same issue back in February when testing the 0.12 release candidate:
I just sent a transaction from my Bitcoin Core wallet and tried to use a blockchain.info link to the transaction to show the recipient that I had sent it, but blockchain.info shows an error message:
I checked on other block explorers, and they all show it just fine:
but I got no response.
I would recommend using a different blockchain explorer. I mentioned 5 working alternatives in the post I partially quoted above.
Edit: see
this reddit thread where I asked for and received an explanation of the new anti-fee sniping code.