Hi -- Downloaded latest Gimp for Mac (using El Capitan), and my interface looks completely garbled. Like fractal numbers. So as you might imagine, learning to use it will be a bit difficult (especially since I'm a tad math challenged :).
I tried changing the language, figured out which setting would be it and while I couldn't read which language is which, I tried a few (one of which was likely english, since it had the same fractals in the beginning for three different sequential languages).
I thought it might be an issue with the current release, so I also downloaded and installed the last 2.8 version, but it exhibited the same problems. I've rebooted my mac in between as well.