-k-
If I do this:
Code:
Break On Cls

Run("Notepad.exe")
Sleep(1)
$dum = SetFocus("Untitled – Notepad")

$text = "asdf","asdfa","asdfasdf","adfasfd"
$scr = "Untitled – Notepad"

$dum = Send($text, $scr)

Function Send($Input,$I)
Dim $, $Checkstring
$dum = SetFocus($I)
;Sendkeys("config t {enter}")
	     For each $ in $Input
	     	     ;$test = CheckString($)
	     	     $dum = SetFocus($I)
	     	     $dum = SendKeys($+"{ENTER}")
	     Next
EndFunction

Function CheckString ($letters)
Dim $a, $i, $s
$a = ""
For $i= 1 to Len($letters)
$a = Substr($letters, $i, 1)
	     Select
	     	     Case $a = "+"
	     	     $a = "{+}"
	     	     Case $a = "^"
	     	     $a = "{^}"
	     	     Case $a = "~"
	     	     $a = "{~}"
	     	     Case $a = "("
	     	     $a = "{(}"
	     	     Case $a = ")"
	     	     $a = "{)}"
	     	     Case $a = "{"
	     	     $a = "{{}"
	     	     Case $a = "}"
	     	     $a = "{}}"
	     EndSelect
$s = $s+$a
Next
$checkstring = $s
EndFunction


with version 4.51 I get:

Code:

asdf
asdfa
asdfasdf
adfasfd

in notepad

with v4.52 i get:
Code:

asdfEasdfaEasdfasdfEadfasfdE


so there's something broken...

for you, this:
CheckString($)

echos the result of checkstring to the console. You want:

$test = checkstring($)
sendkeys($test)

or

sendkeys(checkstring($))

(which is golf code )