Like many people it would seem, I have suddenly become unable to access SkyDrive using the app on my PC. I can open files from the web link, but whenever I try to use the app I just get the following error message: "There was a problem connecting to SkyDrive. Check your internet connection, and then try again." However, no matter how many times I try, it will not connect.  The most annoying thing about it is that it has stopped allowing my OneNote program to sync.  When I check the settings, the tick-box for "Let me use SkyDrive to fetch any of my files on this PC" is now *unticked* (it has always been ticked before), but is now greyed out and nothing I do seems to allow me to tick the box.