I hope the Nesttrader is hang up. Just close the Nesttrader and restart it again. Once u are logged in just see yr connection status is 100% success, Once this is ok you will get the charts.
You need to register for NestPlus to see the charts. http://zerodha.com/z-connect/tradezerodha/nest-plus-for-ztrader/nest-plus-registration
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