Access Denied for localstorage in IE10

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Our users were having issues with web sites using the LocalStorage feature (including Twitter) on Windows 8 with IE 10. When accessing one of these sites with the F12 Developer Tools open, a SCRIPT5: Access is denied message appeared on the console.

After working with Microsoft support, we identified the cause. It turned out to be a problem with the settings on the C:\Users\username\Appdata\LocalLow folder in their user profile.

Each folder on your computer has an integrity setting. More information about the purpose of this setting is here: http://msdn.microsoft.com/en-us/library/bb625964.aspx

The integrity setting on the AppData\LocalLow folder (and its subfolders) in each user’s profile is supposed to be set to “Low” (hence the name). In our case, the integrity level was not set correctly on this folder. To rectify the problem, run the following command in a command prompt window:

icacls %userprofile%\Appdata\LocalLow /t /setintegritylevel (OI)(CI)L

(If there is more than one user account on the computer and the other users are having the same issue, the command needs to be run under each affected user’s account.)

As for how this setting got changed in the first place? In our case, it was caused by a problem in the customized Windows 8 image we deployed to our workstations. For others that are having the issue, my research has revealed that the use of a “system cleaner” utility may be to blame.

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