Just tried again with 4.21 and 4.50 (I don't have 4.22 to hand)

This simple test:
Code:
$=SetOption("CaseSensitivity","ON") ?
@KIX ?
 
$NAME = "Ändern Wäsche"
 
"Test string is:       " $NAME ?
"Using Split/Join:     " Replace_type1($NAME, "Ä", "Ae") ?
"Using character test: " Replace_type2($NAME, "Ä", "Ae") ?
 
Function Replace_type1($s,$t,$r)
	$Replace_type1=Join(Split($s,$t),$r)
EndFunction
 
Function Replace_type2($String,$SS,$RS)
	While $String
		If Left($String,1)==$SS
			$Replace_type2=CStr($Replace_type2)+$RS
		Else
			$Replace_type2=CStr($Replace_type2)+Left($String,1)
		EndIf
		$String=SubStr($String,2)
	Loop
EndFunction


I get:
Code:
[KiXtart 4.21]
4.21
Test string is:       Ändern Wäsche
Using Split/Join:     Aendern WAesche
Using character test: Aendern Wäsche
 
[KiXtart 4.50]
4.50 Alpha TEST Release
Test string is:       Ändern Wäsche
Using Split/Join:     Aendern WAesche
Using character test: Aendern Wäsche