TinyMCE can't resize Youtube videos embeded on Plone 4.3.10rc1

I've upgraded to Products.TinyMCE 1.3.25 on my Plone 4.3.10rc1 installation. When I add an embeded video in edition mode, I can't resize the frame. It occurs only with Youtube videos, but it works fine with Vimeo, por instance.

I have tried an answer in https://github.com/tinymce/tinymce/issues/3614?_pjax=%23js-repo-pjax-container, but without answer yet.

Any issues about that? Thanks in advance...