Gerbview layer view mode os x

Hello people!

First time poster here.

I’ve had a long time issue with the different layer view modes available inside GerbView to present your files. It seems to me that at least on OS X the layer view mode-buttons don’t work at all, at least no visual difference is to be seen. I would love to achieve some kind of transparent rendering to be able to review my files easier.

Anybody else experiencing this? Is there a solution?

kicad version 4.0.5, release build