uart using re-configuration

I am using the PSoC as a switch for 4 different UARTs. I have used dynamic re-configuration.  I can see the output of the UARTs on different pins but I have not been able to input to any UARTs. I have tried the example of using the UART but when I try to do dynamic re_configuration and select one of the four re-configurations the transmitter works ok but i cannot receive any charactures