Hello! I noticed a strange behavior on my Yosemite machine (public Beta 4), for some reason after a reboot my desktop wallpaper is changed to one I used months ago. I change my desktop wallpaper every month to a new, monthly released desktop wallpaper released by a Japanese game company (http://www.falcom.co.jp/calendar/index.html if you are interested). Now after a reboot the wallpaper goes back to the picture from May this year and I have to manually change it back to the one of October. Could this be a bug in Yosemite and did other people here using Yosemite experience this behavior? Or is this a problem that has been seen in previous versions OS X and anyone has an idea how I can fix this? Thanks and wish you all a nice weekend!