Problem Displaying generated Markup File (CLOB column)

Dear Colleague,
I am attempting to display the results of a generated Markup File in a Forms Text Item. The code (Below) is in a WHEN-BUTTON-PRESSED trigger.
Step 1: generates the markup file and stores it in the MARKUP_DOCUMENTS table.
Step 2: Copies the clob column DOCUMENT to the clob variable MYCLOB
--> At Step 2, my form crashes !!!
Is Oracle Forms not able to process CLOBs? The form was compiled as if there was no problem.
How can I access the results of the generated Markup File in the MARKUP_DOCUMENTS table and present it to the Oracle Forms user?
Best regards,
Randy
declare
myclob clob := empty_clob();
read_amount number(4):= 500;
read_offset number(4):= 1;
buffer varchar2(500) ;
begin
-- Step 1:
ctx_doc.markup(index_name => 'documents_index',
textkey => to_char(:hitlist_block.id),
text_query => :search_block.search_clause,
restab => 'markup_documents',
query_id => '1',
plaintext => TRUE);
-- Step 2:
SELECT document
INTO myclob
FROM markup_documents
WHERE query_id = 1;
-- Step 3:
dbms_lob.read(myclob, read_amount, read_offset, buffer);
-- Step 4:
:markup_block.markup_text := buffer;
go_block ('markup_block');
exception
when others then
message ('Document could not be displayed: '||dbms_error_text);
end;

Hello,
This is what i use to display an HTML Forms Text Item:
Declare
   lc$Texte Varchar2(2000) ;
   lf$fic client_text_io.file_type ;
Begin
   lf$fic := client_text_io.fopen('c:\test.htm', 'w');
   client_text_io.put_line( lf$fic, '<html>' ) ;
   client_text_io.put_line( lf$fic, '<script language="JavaScript">' ) ;
   client_text_io.put_line( lf$fic, 'parent.window.resizeTo(600,400);' ) ;
   client_text_io.put_line( lf$fic, '</script>' ) ;
   client_text_io.put_line( lf$fic, '<body>' ) ;
   client_text_io.put_line( lf$fic, '<FONT face="sans-serif" color=#1B62AB size=2>' ) ;
   client_text_io.put_line( lf$fic, replace( :MAILS.TEXTE, CHR(10), '<br>') ) ;
   client_text_io.put_line( lf$fic, '</body></html>' ) ;
   client_text_io.fclose( lf$fic ) ;
   client_host('cmd /C START "x" iexplore.exe c:\test.htm' ) ;
   client_host('del c:\test.htm' ) ;
End;Francois

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