When i have watched a video in a show-box, and i want to close it, a rectangular empty box is left behind on the same location, the show-box was before. It's on top of my website and it will not close, and can not be removed.

When i click on a button in my top menu, to go to another page, it dissapears.

My site is not ready yet, i'm working on it. So it isn't live, but local on my pc.

Is this an error in the software, i'm using version 9.0.6.1775?