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This is only possible when the only changes in the file are in whitespace and/or line endings, e.g. different number of spaces, spaces instead of tabs or change in the line ending (e.g. UNIX instead of Windows). These are all changes that the diff algorithm omits, therefore reporting no changed lines. However, the file scanner does NOT trust the diff engine to detect when a file has changed. It looks at the file size, file modification date and the MD5 and SHA-1 checksums. If any of these four factors has changed the file is reported changed.

What that means practically? If you replace on file with another one that's identical except for tabs, spaces and/or line endings the file will be reported as changed but the diff will be empty.

If this is not the case and you get this result for all files then something is broken in your installation. In this case please install Admin Tools twice in a row, without uninstalling it before or in between. This should replace any obsolete files in the scanning engine.