Seems to have been a problem before mountain lion as well:  http://forum.processing.org/topic/re-open-last-saved-sketch-on-startup

And the 2.0a released changed nothing.

But it seems like it actually is a remnant from an earlier feature, which now is removed:

https://github.com/processing/processing/issues/1238

I find it weird to remove the feature, or at least not making it customisable. It is the standard for many other similar softwares, and at least I find myself more often than not working on the same project over the course of many days without changing.

Is this a feature anybody else than me wants? Thoughts?