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Thank you, your response is quite helpful. I really don't understand the algorithm. Matching is not my long suit. I expected where there are actually more lines that match in a block that the first occurrence would have been selected. At the second occurrence the two lines that start *pSpaceUsed don ...

I will try to attach again.

Attachment 1 (named ExamDiffScreen) shows a page of the left and right images of a comparison. I expected that left lines 85-91 would have aligned with 90-97 on the right. ExamDiffScreen.JPG

To help with diagnosis I will attach a couple of settings screens. Options ...

I have three attachments to include with this post. I am diffing two versions of a source file. It appears to me that the text in lines 85-91 on the left should match with lines 90-97 on the right. They instead are matching with lines 112-121. I don't understand why. [//M:/temp/prestosoft ...