Dear Elliot, I have a bad news on this.
since the last update o mqTranslate this warning has appeared
DEPRECATION NOTICE
As of February 19th, 2015, mqTranslate has been deprecated in favor of qTranslate X.
I’ve made some test but unfortunately, WYSIWYG fails again with qTranslate-X and qTranslate-Plus. (it blanks the fields on saving -> data loss).
Could you have a look? If you need any more information, I am happy to help.
Many thanks
M.