As noted on Apple's official community/forums, there's a bug that renders the text very blurry - many here think that the font choice is causing this, not at all. When rebooted, the font is just as clear and easy to read - more or less - as Mavericks was/is. As noted, again, on Apple's own forums, a restart fixes this, though, at least with me (and some other people), it will return, until another restart. This is a bug, and I can't recall if the thread on Apple's forums mentioned that Apple were aware of this, or not. Curious if anyone else has run into this bug, and what was your setup/config? I'm running a 2009 27 iMac with Radeon HD 4850. How do we go about reporting this to Apple, in case they're not aware of it? The thread on Apple's forum even had one user that had this issue with his Retina iMac. So it's not a Retina vs. non-Retina display thing. If we all report this to Apple, hopefully they'll get this fixed sooner than later.