Missing Images

I’m having issue with my theme where it will not show the feature image for some posts under the main menu drop-downs (the little preview image that appears under the menu with a title).

It happens very randomly, and only applies to the drop-down menu images and not anywhere else on the site. In place of the image it just shows a blank box with a blue question mark in the middle.

Here’s my site: http://www.dsgnmagazine.com

If you scroll over the top menu tabs such as “Web” or “Design Tips”, you’ll noticed a post missing its image.

I’ve tried replacing the feature image, clearing the caching, changing the categories it appears under, and still nothing… just a blank image place-holder.

Can someone help me?

Thanks,
-Tim

Simion, thanks for looking into this. I confirmed that i do have the thumbnail toggled on for the mega menu.

Here is a screenshot of what I’m seeing when scrolling over the “Web” menu item: https://www.dropbox.com/s/g1uq1idpna4adll/Screen%20Shot%202017-09-05%20at%2011.09.25%20AM.png?dl=0

You’ll notice the thumbnail is also missing in your screenshot (far left thumbnail is missing): https://www.screencast.com/t/joaf8b4AZ

What I don’t understand is why this happens, since I do have a featured image on that post, as well as all the other posts that I’ve had this issue with.

Thanks,
-Tim

Just regenerated all the images and cleared the cache… still nothing. I even changed out the featured image several times with new ones.