>>>There appears to be a control character on the 13th line. Could that be it?
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>Well, it turned out that it was indeed that line. The box character is creating the problem. I am looking for its equivalent to replace that. But, this brings an interesting question. What's the proper way of making sure no other characters like that create a problem in SOAP?

The box character is character #1: can't tell for sure it this works, but I suppose you could try to convert all your control characters < 32 (except for CR, LF and TAB) to their entity equivalent (&#x;, where x is the character code).

bye