Elliot…thanks so much for your attention to this, but I’m afraid that after updating to 4.3.8, I’m still seeing the issue on my site. In my case, this is a required image field.
If I try to save without an image, I’m prompted to pick one, but then after doing so….I remain unable to save the post.
Thank you for all of your hard work on ACF…it is an amazing plugin.