Removing $in appears to have fixed the problem unless it was something seemingly unrelated I did later in the code that did it (but I doubt that).
If I'm understanding your post correctly, it's completely relevant.
The file that didn't work had all the newlines removed, making the entire file a single line. Since there was only one line in the file, reading the first line into $in and throwing it away... threw away the entire file, leaving nothing for the loop to read.
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