Looks like Allcoin.com has permanently shut down the IPC market.
It is unfortunate, but we are just a select few - it takes many traders for a long period of time trading much BTC, to keep a market active on 7 exchanges like we did for almost a year. Fewer exchanges may be a good thing - our traders can still buy IPC on several other exchanges. Keep in mind, we have our ad site, banner exchange and we are a payment option on CoinToPay.com