After adding tabs to the list of custom fields, it breaks the 'code/text'-tab of the TinyMCE editor.
I klik the tab, but the HTML-section is empty. When i deactivate the tabs plugin i can see the html-code ( although i have to reload my browser )
Can you please share some screenshots of the issue on your site? Please try to deactivate all plugins except Meta Box, MB extensions and switch to a standard theme of WordPress then check this issue again.
This looks like a weird bug:
I looked for php-errors an console-errors, but: nothing...
I decided to look at the source of the browser.
The text-area gets inline-styling: visibility: hidden;
That isn't supposed to be happening. when i remove the line, i get the complete html, like it should.
It seems that the tab-plugin has something to do with this.