The bug is in WooCommerce v3.1.0. The aforementioned plugin exposes the bug. It is fixed in WooCommerce version 3.1.1. Details available here: https://github.com/woocommerce/woocommerce/pull/15879
Again, not an Enfold or Avia editor bug.
I believe I’ve tracked it down to the conflicting plugin, Variation Swatches and Photos for WooCommerce. It doesn’t appear to be an issue with Enfold or the Avia editor. Since embedded content is cached, it’s difficult to figure out what is causing the issue. With that plugin active, when a post is updated, the oembed metadata value is modified with escaped quotes, breaking the embed code.
<iframe src="https://player.vimeo.com...
becomes <iframe src=\"https://player.vimeo.com...
which then becomes <iframe src="\\https://player.vimeo.com...
etc.
I’ll continue to post new information here as it becomes available.
Seeing the same issue on another site which doesn’t have WooCommerce installed.
Same here. Currently investigating potential conflicts caused by other recently updated plugins, predominantly WooCommerce-related.