I have executed a transaction with BTC and I am now waiting for 6 hours and still have 0 confirmations.
Is the network jammed again for some reason? Or what is the deal with it?
It's just a period of congestion. At the moment, you need to pay 10-15 satoshis/byte to get confirmed in the next block.
Congestion has also been exacerbated lately by drops in hash rate. Before the difficulty adjustment earlier today, blocks were being generated only once every 11-12 minutes. Less blocks = less confirmed transactions. There was a difficulty adjustment today which normalized block times, but hash rate has dropped again so blocks are only being generated once every 10.6 minutes instead of every 10 minutes.