I never had any of the other mail issues people had with 10.9 until 10.9.2. Now I can send but not receive e-mails from Mail with my Gmail account. Another minor issue is that I can no longer remotely view my Mac mini's screen (which is still running 10.9.1) from my 10.9.2 MBP using adaptive quality: it is a complete mess of random colors. If I switch to full quality it works, but very slowly. Last major issue is that since the update I have twice received a message that I could not save to disk, nothing. I had TextEdit open, and I couldn't save the file. Couldn't quit or open any applications. Google Drive quit by itself because it said there was an I/O Disk error. I held down the power button (it beachballed when I tried to shut down the regular way), and it came back on and worked fine. Then it happened again (not being able to write to disk). I booted to Recovery Mode and ran Disk Utility, and the disk is apparently fine. I'm mentioning this in the off chance it's related to the update, but I am guessing it's probably a SATA-cable issue again (it would be the sixth time on this computer, and it was replaced only a month ago under AppleCare). Or it could have been a Google Drive issue. It later said that it had to quit again due to a corruption, and I disconnected Google Drive from my Mac and reconnected it, and it's working fine now. Although, the other issues shouldn't have been related to Google Drive (for example, I wasn't trying to save the TextEdit document to Google Drive).