I did all you asked me, but all i obtained was grey on white. So ok it had the advantage to be visible, instead of white on white, but barely, so i changed directly in the PSPad.ini
Perhaps it's me... You have all to reproduce the bug... Just put 511's files onto those i sent you and change to PSPad dark Color Scheme... It should put grey on white for results of Search/Replace in files :\ -- <https://forum.pspad.com/read.php?6,73811,73940> PSPad freeware editor https://www.pspad.com