I had the same problem. Specifically the Post Processing Plugin list was completely unreadable. I found a workaround:
1. Close Cura
2. Right click or control click Cura in your Applications folder
3. Choose "Get Info"
4. Turn on "Open in Low Resolution"
5. Open Cura - fonts should be rendering correctly now
The main downside of this workaround is that, if you're on a retina display, Cura will appear slightly blurry. At least it's workable though, I was missing key functionality previously.