os_idle_demon Underflow on LPC3250

I am developing with uVision 4.0 for LPC3250 target on Windows XP. The platform is the Phycore phy3250 board. I have compiled and successfully executed code from Keil's RTX_Blinky example and Phycore's uart_example. Although the latter was tested with uVision 3.0, the project file was converted to 4.0 format by the IDE automatically. Since Keil did not have an example that used a UART (and other reasons), I integrated RTX_Blinky functionality with the uart_example project from Phycore. However, when I pull up the OS Support->RTX Kernel window, only the os_idle_demon task shows up with stack usage of "Underflow." The program works fine as I added ADC functionality with serial output twice per second. Any ideas?

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