Thank you all for the help you gave. The problem was the obvious one: too little memory (RAM). That is why always first, or no files processed successfully. When I moved to a machine with 2 GB memory (from 1 GB) all worked well. How can I catch "out of memory" errors? No error was given to indicate that failure, which surprised me.

In reply to Re: Sanity Check: Debugging Help Needed! (Solved: Thank you!) by Anonymous Monk
in thread Sanity Check: Debugging Help Needed! by Anonymous Monk

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