Problem with check boxes in media library when inserting an image

I use the JAWS 18 screen reader. I am trying to insert an image from my media library into a page or into a slide using the Crelly plugin. When I get to the place where I need to check the check box corresponding to the image I want to insert, I cannot select the check box using either the spacebar or by pressing the enter key. I cannot activate the check box to complete the process. I have tried it with both Firefox and Internet Explorer. I have a friend who has tried it with Google Crhrome as well.

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