Windows 10: W10 Apps not loading when offline

Hi,
I upgraded to W10 (pro x64) a couple of months ago and all has been working well until the other day when the pre-installed apps (weather, groove music, calculator, calendar etc . . . all of them) stopped loading if my laptop is offline. Once I'm online they load and work just fine.
They worked offline or online up to a week ago; but now when offline they will just flash up their start window for a split second and close again.
I've tried a few online suggestions for fixing windows apps. . . . . Command line uninstall of the app and reinstall via Microsoft store. Command line system file fixes. Uninstalling the last windows update. Updating apps through the MS Store. But so far nothing works.
As I travel a lot for work I'm not always online; and don't want to be just to play a song or use the calculator.
I've googled through a lot of sites talking about problems with W10 & 8 apps not loading, there seems to be a whole range of similar issues. But so far I can't find any which specifically mention not loading when the pc is offline.
This also holds true for the one third party app which I have installed via the MS Store.

Any advice much appreciated,
Cheers
Matthew

:)

 

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Windows 10 Sync Center - Cannot Set Up Folder for Always Available Offline

I have one W10 Pro laptop that refuses to make folders available for offline use. Windows 2008R2 server, using folder redirection for Desktop and Documents.

1. Sync Center opens fine

2. Manage Offline Files Enabled

3. In 'Set up new sync partnerships', folders listed: Folders(1)

Offline Files

Network files available offline

Folders

4. When I click on Set up, I get the dialog instructing me to right-click folder and select - Always Available Offline

5. In 'View Sync partnerships', I see - You have no sync partnerships set up on this computer. Click ...

6. In file explorer, when I right-click one of the two redirected folders and select - Always available offline, nothing happens; there are no changes. On all of my W10 computers that work, right clicking the folder shows - Always available offline greyed
out with a check next to it.

No users on the offending machine can select any folders for offline use, including administrators. All of these same users have fully functional offline folders on another W10 machine.

What would prevent selection of folders when everything up to that point seems to work?