[racket] Sgl not working

Hello fellow racketeers!

A few years ago i wrote a basic 3D engine in racket for use in the
classroom at my university and now i wanted to get it to work again.
But now when i try to run it I get the error:
"../../usr/local/racket/collects/racket/private/class-internal.rkt:4602:0:
send: target is not an object: #f for method: call-as-current". Which
occurs in the "with-gl-context" function.

Then i tried the gears example from the sgl/examples folder and i got
the same error so i figures that it is a bug.

I am running on ubuntu 11.10 and using racket from svn to get the ui working.

Thanks for any help

//Jonathan