I'm trying to run sandboxes in places, but when the sandboxes need access to 
racket/gui (such as through 2htdp/universe), they get `cannot instantiate 
racket/gui/base' a second time`. I've tried initing racket/gui once in the 
server that starts the places, but this doesn't seem to work. (gui-available?) 
is still false in started places, and they still raise the exception when the 
sandbox tries to load the gui module.

I don't really need to run gui code in the sandbox, so I'm guessing the best 
workaround is to override `2htdp/universe` in the sandbox.

Anyone have either a solution, or a better workaround?

-- 
William J. Bowman

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