I have the SteelSeries Rival 100, have had it for a few years. I find it bizarre that when I install the SteelSeries Engine software for it, mainly to control the LED light, the mouse starts to behave erratically; it randomly doesn't register clicks. But when I don't have the software installed, it works perfectly. I was just wondering if anyone using a SteelSeries mouse has encountered such an issue. And before anyone asks, I don't really fiddle around with the mouse settings, just the LED settings.