[TYPO3-english] Markers Problem - Display Umlaut(äüö) as rectangle

[Lisa]

Hi community,
first sorry for my bad english..
I've a problem with markers.
I try to generate with markers and TS a personel salutation for a 
newletter solution.
The external newsletter-tool generates a link witch points to the Typo3 
Site. There are the markers in the content of the Site i.e:
Hello ###ANREDE### ###VORNAME### ###NAME###,
testtext with üäö...

The URL with the attributes for the salutation:
http://www.webseite.de/index.php?id=244&anrede=Herr&vorname=Ülf&nachname=Testmän

The TS to fill the markers:

#---------------------------------
temp.marks {
   ANREDE = TEXT
   ANREDE{
     data = GPvar : anrede
     }

   VORNAME = TEXT
   VORNAME {
     data = GPvar : vorname
     }
   NACHNAME = TEXT
   NACHNAME {
     data = GPvar : nachname
     }
}
tt_content.text >
tt_content.text = COA
tt_content.text {
     10 = < lib.stdheader

     20 = TEXT
     20 {
         cObject = TEMPLATE
         cObject {
               template = TEXT
              template.field = bodytext
               marks < temp.marks

         }

         required = 1

         parseFunc = < lib.parseFunc_RTE

         editIcons = tt_content:bodytext, rte_enabled
         editIcons.beforeLastTag = 1
         editIcons.iconTitle.data =
LLL:EXT:css_styled_content/pi1/locallang.php:eIcon.bodytext

         prefixComment = 2 | Text:

     }
}
#---------------------------------

The output of the Webside:
Hello Herr [rectangle]lf Testm[rectangle]m,
testtext with üäö...

You can see, that the normal text is right and the satutation is wrong.
Crazy is, that the sourcecode looks good:
Hello Herr Ülf Testmän,
testtext with üäö...
Why???
Please help me
p.s. The Site is utf-8 coded
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
Typo3 4.2
TemplaVoilà


Yours Lisa