Actually thinking more about that, I guess the Run Dialog's bug may be
related to the other ones.
Ruby's Run Dialog doesn't work. When you open that dialog through Java
perspective, it works fine but if you click on a Ruby's run configuration,
the the whole dialog crashes (Run button never enables and other weird
behavior). This happens on Eclipse Europa, on Ganymede it's crashed
regardless of DLTK: when you open run dialog you get an error message.