Cannot submit my user review – error message unclear

Thanks, owen! That was indeed the issue! You've been a great help! Google Translate apparently added an invisible \u200B unicode character ("zero-width space") to my text. FWIW, for anyone interested, here's a PowerShell script examining a text file for its characters and their code points: $file = 'TextFile.txt'; $txt = [System.IO.File]::ReadAllText($file); $chars= @{}; for ([int]$i = 0; $i -lt $txt.Length; ++$i) { $c = $txt[$i]; $cp = [int]$c; if ($chars.ContainsKey($cp)) { ++$chars[$cp]['count'] } else { $chars[$cp] = @{ 'count' = 1; 'index' = $i; 'char' = $c; } } }; $chars | Format-Table To use it, replace "TextFile.txt" with the actual path to your text file. When this script is run, the "index" value listed for each character is the position of the first occurence of that character in the file. With it you can find that character in the text.