iMac Retina Start-up Wallpaper vs Loaded Wallpaper
iMac Retina 27" with a small issue. When I start-up the computer and get to the password screen to log into the computer, the wallpaper I see in the background is often times not the same one I have selected for when the computer is fully loaded and sitting ready to go at the desktop. It's always one of my wallpapers from my Wallpaper folder (not any of the Apple default ones), but from time to time the one showing when logging in is not the one the shows when logged in.
Is there a fix for this or a known issue why this happens?
iMac (Retina 5K, 27-inch, Late 2014), OS X Yosemite (10.10.1)