Yup, creating this thread I noticed the WP version I had was… preeetty old. Just upgraded to 4.0, works like a charm. 🙂
FYI there are problems with your theme in the admin interface with the old version I used. You might want to change the least supported version to 3.9 or something..?
The issues I had was that all the text in TinyMCE were white and that a lot of buttons and stuff didn’t work. I couldn’t, for example, import media to my posts.
And again, do you host the code on Github or something like it? In case I would like to contribute. 🙂
