[racket-dev] drracket fails to start up properly

built from scratch this morning

error messages: 

[1] 847
[:~/Git/Ingenious] matthias% send: target is not an object: #f for method: change-children

 === context ===
/Users/matthias/plt/collects/racket/private/class-internal.rkt:4601:0: obj-error
/Users/matthias/plt/collects/drracket/private/module-language-tools.rkt:39:6: set-lang-toolbar-buttons method in ...e-language-tools.rkt:35:4
/Users/matthias/plt/collects/drracket/private/module-language-tools.rkt:134:6: move-to-new-language method in ...e-language-tools.rkt:93:4
/Users/matthias/plt/collects/drracket/private/module-language-tools.rkt:235:6: after-set-next-settings method in ...e-language-tools.rkt:93:4
/Users/matthias/plt/collects/drracket/private/unit.rkt:628:10: after-load-file method in ...ket/private/unit.rkt:525:8
/Users/matthias/plt/collects/framework/private/text.rkt:298:4: after-load-file method in ...ork/private/text.rkt:79:2
/Users/matthias/plt/collects/framework/private/frame.rkt:1170:2
/Users/matthias/plt/collects/racket/private/class-internal.rkt:3679:0: continue-make-super
/Users/matthias/plt/collects/racket/private/class-internal.rkt:3679:0: continue-make-super
/Users/matthias/plt/collects/racket/private/class-internal.rkt:3679:0: continue-make-super
/Users/matthias/plt/collects/framework/private/frame.rkt:621:2
/Users/matthias/plt/collects/racket/private/class-internal.rkt:3679:0: continue-make-super
/Users/matthias/plt/collects/racket/private/class-internal.rkt:3679:0: continue-make-super
/Users/matthias/plt/collects/framework/private/frame.rkt:1729:2
/Users/matthias/plt/collects/racket/private/class-internal.rkt:3679:0: continue-make-super
/Users/matthias/plt/collects/framework/private/frame.rkt:905:2
...