@Steve: in comment #5, you call interdiff twice, the first time with -p1, the second time without; this is why your interdiff is garbled. You don't need to gzip the interdiff if it's reasonably small.
@Steve: in comment #5, you call interdiff twice, the first time with -p1, the second time without; this is why your interdiff is garbled. You don't need to gzip the interdiff if it's reasonably small.