Adjust Color Curves... is disabled, why?

Hello,
I've just downloaded a trial of PSE 9. I'm evaluating whether or not this product will work for some coworkers with light image editing responsibilities.
With and image open, if I goto the Enhance menu, and select Adjust Color, the option for “Adjust Color Curves…” is disabled (greyed out). Is this a feature locked in the trial, but available in the paid version of PSE?
Thanks,
Duffy

99jon wrote:
The trial version is the full package.
Make sure you have an image open in the editor and are not working with a 16 bit image. Otherwise click Image >>Mode
Then change to 8 bit.
I just checked in PSE6 : the 'adjust color curves' works perfectly in 16 bits

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From: musarticus <[email protected]>
To: Gary Fletcher <[email protected]>
Sent: Saturday, January 31, 2015 8:42 PM
Subject: Adjusting color in part of an image in a photo.
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