Images in master slider disappear when CDN image resizing feature is activated

When the Automtic Resizing option is enabled in Smush CDN, the images disappear from the slides and seem to have a max-width of 1px inlined for the sizes.

We have checked with https://premium.wpmudev.org/forums/topic/smush-pro-conflict-with-master-slider-plugin but this doesn't seem to work.