markoposavec

Just ran into this problem again and found a simple CSS solution:

.wp-block-icb-image-compare .comparison-slider {
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

It works! I have changed the two files and now it’s flawless.

Thank you very much ??

It is perhaps worth noting that the watermark application mechanism appears to have changed since the update: instead of reloading the Media Library page, it now displays a spinning circle-thing over the thumbnail just before it drops the “Cheatin uh?” error.

Switching to Twenty Sixteen is no good, so it’s probably not theme-related. I have also tried disabling other plugins and that didn’t help either.

All users of the site have the same problem.

Tried it, didn’t work.

I have since updated WordPress and the theme to the latest version, but that didn’t help either.

What’s most puzzling is that the error just started appearing out of nowhere, no changes whatsoever were made at that time.