Unusual OleDbException: ?~¿????x(?(?? when connecting to Oracle 10g database, what would be the cause?

I'm working with a legacy application that uses OleDB to connect to an Oracle10g database.

One customer is getting these exceptions being reported quite often:

System.Data.OleDb.OleDbException: ?~¿????x(?(??
   at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)
   at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.OleDb.OleDbConnection.Open()

Has anyone come across an exception message like that before - and is there any fix (other then upgrading the solution to use ODP.Net for it's access to Oracle instead)?

Update

Connection string being used is:

Provider=OraOLEDB.Oracle.1;Password=password;Persist Security Info=True;User ID=user;Data Source=oradev

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Unusual OleDbException: ?~¿????x(?(?? when connecting to Oracle 10g database, what would be the cause?

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