I am on a Windows XP PC at present, that has different settings, but I think what you describe is the problem.
I recall that there was a
Users group with
Full Control but I think that is not enough.
Check the
Properties >
Security tab of other folders that work OK (such as
Plugins).
They should all be
identical.
If they are not all the same then let me know, and say which Windows OS you are using.
The trick is to ensure all the FH folders inherit their
Security settings from their parent folder.
I cannot recall exactly how to do that, but can give exact instructions when back on my Windows 7 PC.
[EDIT]
Now back on my Windows 7 PC, and the following should work on Vista and Windows 8 too.
Ensure you are logged in to an
Administrator account.
Using the
C:\ProgramData\Calico Pie\Family Historian folder, open its
Properties >
Security tab.
It should look like the screenshot I posted above with
Everyone allowed all permissions.
Click the
Advanced button, and then the
Change Permissions button.
Tick
Replace all child object permissions with inheritable permissions from this object and click
OK as shown below if you scroll down.

- PropertiesPermissions.png (69.51 KiB) Viewed 3368 times