HTTP error

When I try and upload photos to the media library I get an HTTP error.
Once in a while it will upload a picture.
I started having this problem after the previous update I was hoping this new update would resolve the issue.
At first I only get the HTTP error on the library page but if I close the browser and reopen I get the picture names but no thumbnails just grey icon where picture should be.
If I click on it the Attachment details page comes up with no picture again …just grey icon in the corner where picture should be.
If I click on view attachment page my website template comes up with the following text:
20160515_095812

June 22, 2016 
Warning: Illegal string offset ‘width’ in /home/ladygreymyst/public_html/wp-content/themes/twentyfourteen/image.php on line 31
×
Warning: Illegal string offset ‘height’ in /home/ladygreymyst/public_html/wp-content/themes/twentyfourteen/image.php on line 31
20160515_095812 Edit

If I click on edit the picture comes up in an edit media page.
But I can not add it into a post.

I tried updating all plug ins with no change.

Any help would be greatly appreciated. I’m at a standstill.

Thanks, Tracey