Virtual COM Port receives no data from UARTprintf after TM4C129X system reset (and no debug session active)

Hi there,

My problem appears at point 11. below, but firstly I describe what does work.

1. I establish a debug session from CCS v5.4 (Win7) to my TM4C129X.
2. The code runs fine and writes via the virtual COM port using a UARTprintf statment.
3. I terminate the CCS debug session (Ctrl+F2) and the virtual COM port is still working as evidenced by text printing in the hyperterm session.
4. I close the hyperterm session and unplug the USB cable to my TM4C129X
5. I plug the USB cable back in, wait a few seconds, see the virtual COM port being enumerated in the Device Manager.
6. I connect again to the virtual COM port with hyperterm and see the characters being printed.
7. I close the hyperterm session and unplug the USB cable to my TM4C129X
8. I power cycle the TM4C129X
9. I plug the USB cable back in to the TM4C129X and I DO see the COM port enumerate in Device Manager
10. I DO NOT begin a debug session via CCS
11. I connect again to the virtual COM port with hyperterm but DO NOT see any characters being printed.  I expect to see them

Are my expectations correct ?   If so what could the problem be ?