Using SkyDrive on 3 PC's (Dell XPS2720; Surface Pro; HPd5100t Desktop) all updated to Win 8.1 Pro 64-bit from same Win 8 versions along with Lumina 920 Win 8 phone.

In Change PC settings; all features are set to synch across all PC's with exception of Themes due to size of photo files used for background.  SkyDrive synch problem has repeated a 2nd time on the Dell since update on 17th.  Understand the icon with 2-clockwise pointing blue arrows when viewing in Windows Explorer directory/folder tree and always wait until file upload/download completes before attempting to open same file on a different PC.

SkyDrive works as expected on the Surface Pro; HP desktop and Windows Phone.  Files "available offline" on Dell & HP; "available online" on Surface Pro.  After a complete clean 2nd reinstall of the OS on the Dell, SkyDrive functioned normally for the past couple of days, when again, files (Excel) that were changed and saved on the HP & Surface Pro would no longer synch (download) on the Dell.  Upload/Download icon in Explorer for both the files and folders being synched remain on and process never starts nor completes.  Multiple PC shut downs-reboots have no effect on synch process.

When my SkyDrive account is viewed in outlook.com; recent files show latest versions with correct GMT time stamps.  Only one that doesn't is again the Dell which shows the last versions before file changes made on the other PC's or Windows Phone.

How can or do I get the files on the Dell to re-synch to the latest changed versions so I can again access/work with/save (without getting the read-only or file doesn't exist message) as I should be able to.  Secondly, how do I prevent this from occurring again on this one PC.

Appreciate any and all help with this.