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There are two lights on the sensor - looking at the end nearest to the sensitvity control, the "12V-power-on" lamp is on the right when the big lens is down. On the left is the light which lights up when the sensor has found an object (sees the line). [In fact, the lenses look the same direstion as the mian lens, but you can see these lights through the yellow plastic of the sensor body.]
The "I got it" light will flicker when the gain is set too high: it will sense the line, but then will not turn off - the RC can't always decide if the sensor says yes or no, so it might or might not get reported in a debug window, or (if it is wired as one of the first three switches (rc_sw1-3), on the OI panel.
Turn the adjustment CCW (while the sensor is flickering) until it just stops flickering. Then verify that the sensor does still "see" the line.
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BTW - like variable ball size, and carpet direction/friction that FIRST has traditionally overlooked, and which have become issues which make or break a robot, I think the line, which FIRST says it is not going to maintain, may become so a big nasty that teams may abandon line following.
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