I have upgraded a desktop PC from windows 8 pro to 8.1 pro. I 8, I had skydrive/desktop & skydrive/MUI. In 8.1, file syncing seems to be ok (as far as I could test it). By the way, I could not start the skydrive MUI app. It says "unable to display files on this PC". IN addition, I cannot turn the "offline file access" on in parameters tab. The option stays greyed. Is there away to fix it ? Thanks.