Nothing should interfere with the Wii console. The sensor bar is also not a sensor bar in any kind of sense. All it does is produce two IR beams that the Wii-mote picks up and uses to calculate movement data. This data is sent directly from the Wii-mote to the Wii, not involving the sensor bar. If you put two candles in front of your TV, the Wii-mote will still work as usual.
If anything is being interfered with, it is the Wii-mote. It is fairly sensitive to heat sources (which give off IR). For example, your TV can be mistaken as a third light, or maybe a candle or lamp. But an Xbox or DVD player's LED? I doubt it, especially if it's just your Wii that is next to it and not the bar.
As far as Red Steel being jumpy and nothing else doing the same, I'd simply blame it on Red Steel.
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