Has anyone else experienced garbled text, especially in Safari, after upgrading to El Capitan? I'm enrolled in the Public Beta program, and have sent a couple of Feedbacks to Apple about it, but the problem hasn't been fixed yet.
I'm having the same exact problem and it started at the same time, after upgrading to El Capitan. Have you found a solution? I saw some old posts that suggested Helvetica Fractions caused similar problems. I removed that from Font Book but it hasn't gone away.
I just upgraded and have the same problem. Narrowed mine down to a font issue. I had to remove my version of Helvetica Neue and it cleared up the problem.