The BATS snafus come as the Securities and Exchange Commission is examining whether some rapid-fire trading firms such as Getco and Tradebot Systems Inc., another BATS investor, have used their close links to computerized stock exchanges like BATS to gain an unfair advantage over other investors. The wide-ranging probe, which was detailed in a front-page article Friday in The Wall Street Journal, is examining a number of electronic exchanges. The probe is at an early stage and there is no suggestion of wrongdoing by trading firms and exchanges.