When using Metabox with Oxygen, the WSYWYG custom field is unusable because the paragraph tags are stripped out of all copy. Only the headings are retained properly. Even if the <p> tags are put it manually, they're lost again immediately on save.
How can this be resolved? I'm using the latest version of Metabox and the latest version of Oxygen (4.02)
You happen to use oxyextras or are willing to start using it? Then you just have to find this setting: Format & run shortcodes. Applies wpautop (for WYSIWYG content fields).
It works for multiple elements (since version 1.4.1).