Most Bitcoin users will be well aware of the ongoing transaction queue issues right now. A lot of transactions are stuck in the mempool as they await network confirmations. Earlier today, it appeared close to US$1bn worth of BTC was stuck in limbo. Developments such as these highlight the need for a Bitcoin scaling solution, albeit that is much easier said than done.
Read more here: http://www.livebitcoinnews.com/bitcoin-transaction-backlog-surpasses-us1bn-mark/