Sideframe is not shown (Google Chrome, Mac). display: block and no one changes it

Hi, I'm not sure whether it's a bug or some kind of feature, but in my case I coulndt make the sideframe appear, but as soon as I added this little show() method everything was working as it should.

Can you please take a look at it?

Kind Regards
Merge pull request #2311 from abossard/patch-1

Sideframe is not shown (Google Chrome, Mac)