If I uninstall LR completely, surely that should wipe any other permissions issues out? I altered the two settings you described in your first response but they had no effect. I am only getting the defaults, nothing else.
Uninstalling & reinstalling may or may not wipe the permissions issue out. I forget if when uninstalling LR, it asks whether or not to keep your settings. So it's possible it could keep your appdata directory intact.
If you're sure you successfully changed the permissions on: "C:\Users\[Your User Name On The Computer]\appdata\roaming\Adobe\Lightroom"
... And it still doesn't work -- then I'm not sure what else could be tried.
I suppose you may also want to try changing the permissions on the entire Adobe directory: "C:\Users\[Your User Name On The Computer]\appdata\roaming\Adobe"
But outside of that, I'm not sure at this point. When changing permissions - you
are following the directions in some of the previous articles I pointed to, right??
As in (one way): right-click the folder - go to "Security" Tab - select "Advanced" - and in the "Advanced" dialog, make sure your permissions are 'Full Control' for your computer-username & "Administrators" ------ Also make sure the checkbox at the bottom is checked to "Replace all child object permissions..."