Can't change background images on Panino Theme

Hello, for some reason I cannot select images for the image slider on the home page on the panino theme.

I have already removed all other plugins and different browsers (safari/firefox/chrome). Issues are:
1. When I add slide button nothing happens.
2. Also, pop-up box seems a bit pixelated (not sure if this is the same issue)

Can you please give me some suggestions on what the issue could be.

I have added a screen shot for you.

Thank you in advance