A public beta release of the new LED Matrix Studio will be out in a week or so. I think (hope!) the major bugs have been fixed, there are still some minor things left to tweak (and others to discover), but on the whole, it's very stable and usable.
I'm uploading source code every day or two, so if you want to build and test it yourself that's the easiest way, but if you want access to the private test builds then let me know.
In addition to many GUI improvements, there are also many old bugs that have been fixed, and several new additions.
The header image was generated from my open-source fractal tool Pretty Chaos, get it from my github repository.