Hopefully you can help me out. Below is a screen shot of my Widget Instance Edit screen (CMS > Widgets > [Widget Instance Name]).
The Network tab in Developer tools shows a 500 error for all Widget instances. This also happens to newly added Widget instances. When looking at the page source, it becomes apparent that the page is incomplete and that is always cut off somewhere within the javascript, which script tag which sits in div.entry-edit.
Any ideas on how to solve this issue?