IWR6843AOP: 3D Counting Demo void MmwDemo_uartTxTask(UArg arg0, UArg arg1) issues with snprintf

I altered the 3D People Counting Demo to output via the command port instead of the logging port.

In void MmwDemo_uartTxTask(UArg arg0, UArg arg1) I added the following which prints just fine...

char logMessage[24] = "count:255 \n\r";

/* wait for new message and process all the messages received from the peer */
while(1)
{
Semaphore_pend(gMmwMssMCB.uartTxSemHandle, BIOS_WAIT_FOREVER);
startTime = Cycleprofiler_getTimeStamp();

/* Log the message on the UART CLI console: */
if (gCLI.cfg.usePolledMode == true)
{
/* Polled mode: */
UART_writePolling (gMmwMssMCB.commandUartHandle, (uint8_t*)&logMessage[0], 22);
}
else
{
/* Blocking Mode: */
UART_write (gMmwMssMCB.commandUartHandle, (uint8_t*)&logMessage[0], 22);
}

GPIO_toggle(gMmwMssMCB.cfg.platformCfg.SensorStatusGPIO);

gMmwMssMCB.uartProcessingTimeInUsec = (Cycleprofiler_getTimeStamp() - startTime)/R4F_CLOCK_MHZ;
}

Which very happily outputs "count:255 \n\r" to the command port.

However,

If I add in snprintf, the code does not output anything at all to the command port and the code appears to be frozen. It never reaches GPIO_toggle(gMmwMssMCB.cfg.platformCfg.SensorStatusGPIO);

char logMessage[24] = "count:255 \n\r";

uint8_t numTargets = 29;

/* wait for new message and process all the messages received from the peer */
while(1)
{
Semaphore_pend(gMmwMssMCB.uartTxSemHandle, BIOS_WAIT_FOREVER);
startTime = Cycleprofiler_getTimeStamp();


/* Format the message: */
snprintf (logMessage, 22, "count:%03u \n\r", numTargets);

/* Log the message on the UART CLI console: */
if (gCLI.cfg.usePolledMode == true)
{
/* Polled mode: */
UART_writePolling (gMmwMssMCB.commandUartHandle, (uint8_t*)&logMessage[0], 22);
}
else
{
/* Blocking Mode: */
UART_write (gMmwMssMCB.commandUartHandle, (uint8_t*)&logMessage[0], 22);
}

GPIO_toggle(gMmwMssMCB.cfg.platformCfg.SensorStatusGPIO);

gMmwMssMCB.uartProcessingTimeInUsec = (Cycleprofiler_getTimeStamp() - startTime)/R4F_CLOCK_MHZ;
}