This is a bug, and it seems almost impossible to resolve (do a forum search to learn more). You can try to replace in Hex mode (from View menu): Search for (e.g.) 0D0A. But be sure to make a backup first, and be warned that it breaks your undo history. :-/
-- <http://forum.pspad.com/read.php?2,32250,32251> PSPad freeware editor http://www.pspad.com
