You guys should also look at the focusing modes. The D5100 has three servo modes.
AF-A (automatic)
AF-S (single)
AF-C (continuous) for action shots
You then also have the AF area modes:
-Auto
-Single point
-Dynamic
-3D
I'm not 100% sure but the Live View has a few different focus settings on it's own like facial recognition that may mess with what you're doing. If you're not able to fire the shutter, it might still be searching for a focus point.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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