Timer Interrupt with SafeRTOS

I'm fairly new at using safeRTOS, attempting to add my first interrupt handler to a project derived from the SafeRTOS demo which came with the DK-LM3S9D96.  It remains similar to the original insofar as it is serving a webpage via. lwip.  There are some other, very basic tasks.  The snag I am running into at this time has symptoms similar to when I had attempted to use printf from inside safeRTOS.  When I enable the timer interrupt, I get the following error; the interrupt handler is doing nothing more than clearing the interrupt flag.

Invalid CIO command (18) in the CIO buffer at address (0x2000d3cc) wasnot recognized. Please check the device and program memory maps.

Looking at the memory map I find this:

.bss       0    2000066c    0000d928     UNINITIALIZED
                  2000066c    00006a24     lwiplib.obj (.bss:memp_memory)
                  20007090    00005814     lwiplib.obj (.bss:ram_heap)
                  2000c8a4    00000390     lwiplib.obj (.bss:mboxes)
                  2000cc34    00000200     idle_task.obj (.bss:g_pulIdleTaskStack)
                  2000ce34    00000200     lwiplib.obj (.bss:g_pulStack)
                  2000d034    000001f8     lwiplib.obj (.bss:lwip_stats)
                  2000d22c    000001a0     lwiplib.obj (.bss:sems)
                  2000d3cc    00000120     rtsv7M3_T_le_eabi.lib : trgmsg.obj (.bss:__CIOBUF_)
                  2000d4ec    00000110     LWIPTask.obj (.bss:g_ppcSSITags)

The only traffic I can find about trgmsg.obj is that it has to do with keeping track of IO buffers, so I'm poling around looking for ideas on what this problem might be.