Inline image preview on speed grader not working

[marty2]

Students are uploading images for assignment submissions. While the images can be downloaded, the inline preview does not work.

If applicable, the following error appears after clicking the link to show the image inline:

[gnoack · Accepted solution]

Hi Marty2, 

I had a similar issue and the cause was an AdBlock extension I was using in my web browser.  I suggest trying a different web browser that doesn't have any extensions installed, disabling any ad block extensions for Canvas, or even use Incognito mode to see if that fixes the issue.  

Others have had similar issues. https://community.canvaslms.com/t5/Question-Forum/Speed-Grader-Not-Working-in-Chrome/td-p/203759

[marty2]

Yep, that was it. For the Canvas devs, it was the Redux Dev Tools extension