This is happening on multiple servers, lcoally and with various hosts I have come to discover. It seems that plugin experiment is pointing to ACF. As far as debugging goes. I have no idea how to execute what you are suggesting.
Frankly, I am getting a little nervous about using this product knowing that there now seems to be widespread issue across a dozen or so client sites I am using it on. Any additional help getting this resolved would be extremely helpful…
Regards,
J
