64-bit driver only returns first row of table

I have a C++ application using ADO (the MSADO COM components) and the Oracle OLEDB provider for database access. The application works fine on a 32-bit computer using the 32-bit Oracle client and driver. However, when I run a 64-bit build of the application, running on a 64-bit computer (Windows Server 2008 x64), using the 64-bit Oracle client and driver, a SELECT operation returns only the first row of the table.
Note that this is only happening with the ActiveX ADO components. ADO.NET is not having a problem.
In both cases I am connecting to the same database, which is Oracle 10.2 (32-bit) running on a different server. I have tested with Oracle client 10.2.0.4 and 11.1.0.7 and got the same result in both cases.
I have reproduced the issue with a simple table (one column, NVARCHAR2(255)) and simple code.
In the code, I execute "select count(*) from tablename" and get the correct record count (more than one record). But when I then open the recordset ("select columnname from tablename"), ADO reports EndOfFile after I have read the first row and called MoveNext on the recordset.
My Oracle knowledge is limited so I don't know if there are driver properties I should be checking.
Anyone have ideas?
Thanks in advance.

For 10.2 it's fixed in 10204 Patch 21 and higher.
For 11.1 it's fixed in 11107 Patch 12 and higher.
Cheers,
Greg

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tem wrote:
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