I'm running DrRacket 7.5 on MacOS 10.14 (Mojave), and I'm seeing the 
"signature boxes" (previously known as "blue boxes") as expected in the 
upper-right corner of the definitions window and the interactions window 
when using the Racket language.  However, if I choose a teaching language 
(Beginning Student, Intermediate Student with lambda, etc.), then the 
signature boxes are never visible, even though the checkbox "Show signature 
boxes and signature box arrow semi-circle in upper-right corner" is checked 
in the preferences.  Is this by design, and if so, is there a way to change 
it?  I'd like to introduce a young student to Racket, and the signature 
boxes would be very helpful (since it basically brings a big chunk of the 
documentation right into the user interface).

Best regards and a happy new year to all,


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