SYSCAT.NICKNAMES query returns ERROR [58005] [IBM][DB2.NET] SQL0902 An unexpected exception has o (4270476)

I tried to run the following select statement in Toad Editor window:
SELECT * from SYSCAT.NICKNAMES
Returns 8 rows then fails with error:

Error:2/23/2012 3:11:18 PM 0:00:00.937: Lookup Error - DB2 Database Error: ERROR [58005] [IBM][DB2.NET] SQL0902 An unexpected exception has occurred in Process: 5800 Thread 54 AppDomain: Name:toad.exe
There are no context policies.
Function: DB2DataReader.Read()
CallStack: at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
at System.Environment.get_StackTrace()
at IBM.Data.DB2.DB2ConnPool.HandleUnknownErrors(String strFncMsg, Exception exception, Boolean bThrow)
at IBM.Data.DB2.DB2DataReader.Read()
at Quest.Toad.Db.ToadDataAdapter.InternalReadBackground()
at Quest.Toad.Db.ToadDataAdapter.InternalFillBackground()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart() InnerException Message: Specified argument was out of the range of valid values. Check InnerException property for more detail. SQLSTATE=58005

I also tried to view the data in the Explorer window with the same results. This works fine in IBM's DB2 Control Center. 80 rows are returned.