V11 crashes on PRINT SELECTION

Hallo,
I am having big problems with print commands. The programme crashes  
every time that I try to execute the following command :

OUTPUT FORM([TRADER];"TR_PRINT2")
        PRINT SELECTION([TRADER])

The background :
  the user makes a selection in the standard list form of the  
table,then selects print in my menu bar which fires the above code.  
The output form was built using the wizard.
I am running 4d v11 (developer) on a MAC with 10.5.2. I am not  
compiling the app but using it with runtime.
The 2 print dialogs are shown, the crash occurs when user hits print  
( or preview or PDF)
TIA
Martin

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