Ah, until your last comment it was not clear that this was on the “Add Term” page.
At least that’s where I’m seeing this bug. For other users in this thread it seems to happen on other pages, too (but not for me).
I suspect this has something to do with WP submitting and reloading the fields on the page through AJAX and scripts needed for the wysiwyg field are not loaded properly, but I don’t know.
I’m pretty sure there’s no problem with WP core code here, because a standard taxonomy does not have a WYSIWYG-field, so there’s no need to handle such scripts.
You should submit a but report on this here
Thanks, will do.
