Try restarting your iPad. Press and hold the Sleep/Wake button until the red slider appears. Slide your finger across the slider to turn off iPad. To turn iPad back on, press and hold the Sleep/Wake until the Apple logo appears.
Know more about how to sync iPad 2 contents to Macbook, which included the detailed tutorials of how to transfer your iPad 2 to your Mac.
Hopefully this works for all of you like it just worked for me!
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