Runtime under Windows 7 (64 bit) SP1 RC2 error when XpressQuantumGrid is bound to ADO recordset

We are using the XPressQuantumGrid in bound mode with an ADO recordset
under Windows 7 (32 bit) SP1 RC2 no error occurs, but under the 64 bit version we run into problems
We are using Visual Studio 2005.
Here is the program flow to fill the ADO recordset and bind it to the grid control:
// This way we import the ADO and the QuantumGrid
#pragma warning(push)
#pragma warning(disable:4192)
#import "msdatsrc.tlb" no_namespace
#import "dXDBGrid.dll" no_namespace, no_implementation, raw_interfaces_only, exclude("IAsyncManager")
#pragma warning(pop)
// The "msdatsrc.tlb" is from 14.07.2009
// first the refresh is stopped
m_Grid.GetEx().SetLockRefresh(TRUE);
// we create a ADO recordset which is not connected to a database
_RecordsetPtr spRecSet(__uuidof(Recordset));
// Add columns…
spRecSet->Open(vtMissing, vtMissing, adOpenUnspecified, adLockUnspecified, -1);
//The ADO recordset is bound to the grid like this:
m_Grid.SetRefDataSource(spRecSet);
m_Grid.GetM().FullExpand();
// Turn refresh on again
m_Grid.GetEx().SetLockRefresh(FALSE);
Even if the recordset is empty then this line gives a general exception:
m_Grid.GetDataset().GetADODataset().UpdateBatch(arAll);
In the debugger output window following information is displayed
First-chance exception at 0x765ab727 in qw.exe: Microsoft C++ exception: CxException at memory location 0x00186848…
First-chance exception at 0x765ab727 in qw.exe: Microsoft C++ exception: COleDispatchException at memory location 0x001869ec…
When some records are added to the grid and we interate through them,
we enter an endless loop (next is not moving to the next record) and the VARIANT value is always empty.
m_Grid.GetDataset().First();
while (!m_Grid.GetDataset().GetEof())
{
        VARIANT varValue = m_Grid.GetDataset().GetFieldByName(FIELD_ID);
       if (VT_EMPTY != varValue.vt)
       {
              // Do something…
       }
        m_Grid.GetDataset().Next();
} //while
Any idea what's wrong?
Thanks for any feedback.