(sorry for all my posts!?) Menu/Dialog boxes background transparent?!

Hi,
First off, I want to apologize for all my recent posts but since I’m new to Kodi, I’m obviously running into lots of problems. I can promise I do search the forums first before posting!

All of a sudden my Menus and Dialog boxes have gone transparent?! How can I get it back to normal? Thx!

(before I click on ‘add videos’…)

(after I clicked on add videos….)
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I gotta say that the background image is not helping at all but I couldn’t manage to change that either?! I set it to randomly show movie art but it’s stuck on that one??