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On My XE3 die Query Editor throw an Exception in KeyPath cause of an unassigned Variable.
I could not dig into the Deep but this Workaround should show you the place !

function TCREditorForm.KeyPath: string;
begin
if assigned(FCRDesignUtilsClass) then
Result := '\SOFTWARE\Devart\' + FCRDesignUtilsClass.GetProjectName + '\Editors'
else
Result := '\SOFTWARE\Devart\DAC\Editors';
end;

Best Regards

Hello,

You most probably don't have reading/writing permissions for the HKEY_CURRENT_USER\Software\Devart registry branch, as all our visual forms save the option exactly to this branch. Try to give the writing permission for this branch to the user.