5-port HDMI switch is a bust

The new 5-port HDMI switch I ordered to replace my existing 3-port switch arrived today, and at first it seemed to work great. But later we discovered a problem... it would cause hiccups in the video and audio output by TiVo through the composite outputs, which is extremely weird. Why would an HDMI switch have any affect on the composite outputs? But it does, and the composite outputs are fed into the bedroom, so for our purposes that switch is not usable and I had to go back to the 3-port switch.