The mysterious cause for the AVR program behaving unpredictably is solved thanks to the AVR Dragon's hardware debugging capabilities. The reason is that I was using too much data memory and it was causing the stack buffer (which resides at the end of the data memory) to overrun into some of the ld-v1000 interpreter's global variables. This would cause unpredictable behavior (and a lot of errors).
I've worked to reduce my data memory usage and have freed up about 400 bytes for the stack which should be more than enough. I can't test it right now though because my NTSC source (my camcorder) ran out of battery power and I don't have the power cable handy. So tomorrow will be the big test.
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