I know that you were writing to the original poster, but I also had that kind of gap in my WAIS scores. If I understand correctly, that kind of gap MAY mean that you have a nonverbal learning disability. The score gap would indicate a need for further testing to see if you do and what kind.

I'd be interested to know why the processing scores are still normal. My guess would be that those parts of the test included tasks that the taker did well at and parts at which they were awful.