Adrien

did you have a look at 

Display>>startUp  "DisplayScreen startUp"
        Display setExtent: self actualScreenSize depth: Display nativeDepth.
        Display beDisplay

this is what is happening when an image is launched
can you try to execute 
        Display setExtent: self actualScreenSize depth: Display nativeDepth.
        Display beDisplay

in a script?

Or may be you could 
        - avoid the headless argument when running the image and 
        - have a flag there and make sure that you invoke
                Display setExtent: self actualScreenSize depth: Display 
nativeDepth.
                Display beDisplay
        when an error have.

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