Shadows doesn't work. How to fix it?

When I go to Edit > Adjust > Shadows and start the slider to brighten the photo, the screen goes blank. This is a much-used feature. I haven't used the Macbook for a few months, and I've updated software; it worked before. I want to improve some pix before posting them on my travel blog.  How can I solve this?

this could be a few reasons,
1. try and update the device to the latest firmware via itunes, to check you on are on 4.3 go to settings>general>about and under version, if is lower than 4.3, update the device
2. if this fails remove any cases or screen protecters (silly, i know) that may block the sensor
3. if that fails, take to the nearest apple store, and describe your problem, they will either replace a=or repair
hope this helps
chris

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