I sent a report to Apple already, but wondering if anyone else is having trouble with their wallpaper defaulting back to the Mavericks "wave" picture? I have my wallpaper set to rotate through a series of photos I have stored in a folder named "Wallpapers." Every once in awhile(usually after having been asleep for 3-5hrs.) The wallpaper will be set back to the default "wave" picture that comes preinstalled on Mavericks. It's not a huge issue, but I love my rotating photos(all retina quality landscapes) and hope it gets fixed in the GM. Let me know if you've noticed the same issue.