I have Acrobat XI Pro. My Signed tab for form field properties is not working correctly. I can select the Mark As Read-Only circle option, but I am NOT ABLE to select the checkboxes when I go into the Pick. Select All and Deselect All works. I can not place a check mark in box of individual items.
People have reported something similar when selecting field for a calculation, and the fix seems to be clicking around the check box area until you find just the right spot, which may not be quite where you think it should be. This has never happened to me but it is what others have mentioned.
George is correct. I had to click slightly to the left of the check box to select it.