Not sure if this is a tinymce problem or a bug in 3.9 maybe.
After updating a post, random seeming spaces are removed from texts in the posts. In a text with around 100 words around 5 or 6 spaces were missing after updating which removed any breaks and made it appear like one big wall of a text and some of the words werewrittentogetherlikethesenow.
Did not have the problem before the 3.9 and the tinymce 4.0 update (am on 4.01 now)
This happens only after updating.
Made a screenshot, the upper version is how it should look, the screen below is after updating the post 2 times