I'm failing to upload application or workspace static files. The error ‘message’ appears in the HTML above the upload box - it's not an expected message as it's not appearing in a message area.
The message refers to bad JSON and the excerpt it shows includes an opening html tag.
…and this sounds familiar… I seem to have had the same issue with a 19.1 instance which wasn't resolved. It may have been the same instance…
Any idea what might be happening?