Just go to Settings -> Updater -> Reset all settings. This will restore all settings back to default.
I do not think that this will fix it though as there is no reason for the file browser not to show up directories other than they are non-existant.
If you use Vista: Did you move or copy around the live files lately? Vista virtualizes writing access to the \program files folder and reroutes the files to another directory if not in admin mode. The updater might not be able to see the files then. However I have not found out when files are rerouted and when they are visible to other applications yet as I did not have the time to play around with it...
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