A Measurement And Function Question-

Can someone please tell me why check box "Show Segment Values" sometimes will not allow the user to actually make a check mark to show on the drawing. The command Show Segment Values is in dim mode which means it is not an active feature. Very frustrating. I have no idea why it does this on occasion. I am hoping there is a simple answer to this. Lock button is not engaged as that is the first thing I will always check. Has anyone else had this problem or issue? I have ayttached a picture for convenience.

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