What a shame Field editor since EE2.7 is buggy, and it's very difficult to contact the author, no e-mail, no Devot:ee forum support.
It's unusable because always appears this error message when I try using it:
This is a Matrix Celltype, it wouldn't take much to make it into a Fieldtype - but why would you with Matrix around?
This message appears for any fields (textarea, expresso......) even without Matrix around.
Does someone report the same error??