I've recently updated my Mac Mini to El Capitan and I am having problem with some of my apps: text is not displaying inside them. I am facing this issue with at least this apps: GitHub for Mac: Finder (folder names at the left panel and tags are empty) and Mail app
I thought that it can be the font issue, so I tried to go to the Fonts app and remove all duplicates, remove all fonts with errors and then reboot - no luck, still the same.
What can cause such a behavior? It seems to be the system-wide issue (I tried to run Finder in Guest user and the issue was still present).