An error has occurred in pgAdmin II:frmMain.tvDatabases:

We've been using pgAdmin II v 1.2.0 for a few weeks now and it has worked
famously, but today three separate users have complained about this error,
which occurs after connecting, and clicking on the databases.  It opens a
modal dialog entitled "pgAdmin II Error":

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An error has occurred in pgAdmin II:frmMain.tvDatabases:

Number: 457
Description:  This key is already associated with an element of this
collection
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after which, you can still browse the databases node.  After selecting a
database, and selecting the "tables" node, another dialog is presented:

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An error has occured in pgAdmin II:frmMain.tvTables:

Number -2147217887
Description: Multiple-step OLE DB operation generated errors. Check each
OLE DB status value, if available.  No work was done.
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It did allow you to browse *some* of the tables (112/430), but now does not
show any.  Since it occured for multiple users simultaneously, it would
seem more likely to be a server issue that a pgAdmin issue, but does anyone
have any ideas?