The following code worked fine in 4.0.6 for a trivial stored procedure (in MSSQL7) that returns multiple result sets, but in 4.2.0 it hangs (and then timeouts) at the first call to odbc_next_result().

  $conn = odbc_connect($ODBC_CONN, $USER, $PASS);
  $rs = odbc_exec($conn,$SP);
  do {
    while (odbc_fetch_into($rs,$row)) {
      foreach($row as $f => $v) {
        print $f . " = " . $v . "<BR>";
      }
    }
    print "<BR>";
  } while(odbc_next_result($rs));

Without the outer loop for odbc_next_result() the code works fine and returns the data in the first result set, as expected.