Thanks for your effort.
More debugging info
stencilType = "BPMNDiagram"
this.id = "Definition"
ORYX.Core.StencilSet._StencilSetNSByEditorInstance = Object { Definition=[1]}
ORYX.Core.StencilSet._StencilSetNSByEditorInstance[editorId] = [undefined]
i really don't understand why it is not working...even after re-installnation...
my java is "1.6.0_25"...