How to run Power Profiler Kit on top of nRF52832 with USB/UART communication line used by application

My setup: nRF52832 with nRF6707 on top.  My embedded application synchronously exchanges UART messages with a desktop application that feeds it data (on demand from embedded app).  I am interested in power profiling my embedded application . COM port is configured at 115200 baud. /8 byte/1 stop/ no parity/no flow control. With the power profiler running, I find that the desktop to embedded messages are getting in, but the return side hangs on UART's app_uart_put() byte. When I remove the power profiler, all is ok. 

How would I make both power profiler and UART app traffic work side by side?