Lately, the code within the WYSIWYG fields has not been visible. I have tried disabling plugins, and there has been no change. It seems to impact posts with content that were created before the removal of the free version requirement (only running AIO now). The issue stems from an inline style of visibility hidden in the textareas (has class rwmb-wysiwyg). I am assuming some JavaScript is supposed to swap that out, but I am not getting an error and cannot find the source of the issue. I have created new records and no issue. My solution was to add some CSS
textarea.rwmb-wysiwyg {
visibility: visible!important;
}
But this could have implications later on. I am hoping this is an "easy-to-fix" bug.