"COM object that has been separated from its underlying RCW cannot be used."

I've started getting this exception since installing vs2005

The code this is causing the exception is:
<code>
try
{
m_command.CommandText = GetAccessSprocString(m_spDeleteProtocol);
m_command.Parameters.Clear();
OleDbParameter param = new OleDbParameter("_protocolID",
protocol.ProtocolID);
m_command.Parameters.Add(param);

// open the connection and execute the update
m_connection.Open();
m_command.ExecuteNonQuery(); // THIS IS THE LINE THAT CAUSES
THE EXCEPTION
}
catch (OleDbException e)
{
m_log.LogError(e.Message, new StackFrame(true));
}
catch (Exception ee)
{
m_log.LogError(ee.Message, new StackFrame(true));
}
finally
{
m_connection.Close();
}
</code>


I honestly can't tell what is doing this. Googling hasn't shed much light.
Anyone know common causes for this exception?
Thanks for any help,
Steve