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More than likely bit depth as mentioned. Change to 8 bit and more options are available. Also make sure that you actually have the image active/selected and not just a mask or layer. Very weird that crop didn't work but now that I think about it crop is generally selected as a tool and not in a drop down menu. The "crop" that you may be seeing in the menu is for if you make a selection around a certain part of the image you can then select "crop" and it will crop out anything not in that selection. That may be the issue. Do a selection and see if the "crop" is active.
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