[NTG-context] Tex Errors But Good PDF Output

I'm using definitions and abbreviations in section titles and get errors from TeX during processing (using texexec). If I ignore the errors and hit return repeatedly, eventually the process ends and I get an apparently good PDF file. I've included the log file--notice the complaints about undefined control sequences. I'm using a master tex file and \input the various chapters (I've turned off all but a couple of inputs for debugging). Is there anything apparent I'm doing wrong? Thanks so much. -Tom