What does it mean when my program dies when trying to access data at the address 0xFEFEFEFE?
Your program probably took this pointer from an uninitialized data area obtained from malloc(). The number 0xFEFEFEFE is the default fill pattern that Memory Advisor in LITE mode uses for new data areas. You should be familiar with the fill patterns shown below, because they might appear in your program. Knowing them will make it easier for you to recognize them if they cause a problem.
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