Since the last update, problems with pictures and galleries

Ever since I got the update two days ago, my pictures have been haywire, which is a major problem since I am a photographer. I can access old pictures but when I go to access newly downloaded pictures my phone is useless. This is true especially when going to upload pictures to Instagram, all I see is gray boxes where pictures used to be. How do I fix it, and is it even possible to work around or fix? I am decent with technology but not by any means a genius, and I don't have six spare hours to mess around with it. HELP!!

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