UPDATE: The problems from earlier today have been resolved. Everything should be back to normal.
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There has been a failure in the link between WMS and WorldCat Local. From the WorldCat Local side, this means that location and availability information for our holdings is not currently available. From the WMS side, this means that no data that lives on the WorldCat side is visible or searchable (including holdings and title data).
OCLC is aware of the problem and is working to resolve it as quickly as possible.