No links found

I posted this inscrutable question before, and no one could help but someone eventually will solve this:

When I do a check your links site-wide, DW finds all links perfectly.

When I do a change links site wide, DW says, "no link to (the link I entered) is found.

Even though, of course, there are hundreds of those links sitewide, which DW  just confirmed it sees in the check links site-wide.

I thought maybe it's because I had a file open or selected, so I put highlight on the root folder at the top. No luck. Must be something else I'm doing..