I’m also having this issue and can’t figure out how to roll back to 5.0.7, what am I missing?
EDIT: nevermind, I figured out what the issue is and will work around it for now.
ISSUE: For those that are curious, the issue arises if you select an image with original dimensions that are smaller than the ‘Preview Size’ size you’ve set.
By default when you create an Image ACF field, the ‘Preview Size’ will be the default WordPress 150×150 ‘Thumbnail’ size. The image I was trying to select was 140×140 and ACF was struggling to find the preview image to display so it just spat out the error.
I fixed it by going back to my ACF panel and selecting my custom image size for the ‘Preview Size’, and it works just fine.
Obviously this isn’t ideal, and should be fixed in 5.0.9 but for anyone looking to avoid rolling back their ACF version and keep working in the meantime I suggest just telling ACF to use a really small ‘Preview Size’.
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