Description

After upgrading to 1.2.0+ the admin UI is completely disabled for entries that contain an oEmbed field. This happens only after the entry is saved with a value for the field. Once the iframe preview is visible, the UI becomes unresponsive.

It seems as if javascript is completely disabled at this point. Image previews don't load, field tabs don't work, fields themselves are not clickable. The problem persists after reloading the page.

Environment