Try using the latest Dolphin revisions and see if you can still reproduce the black screens. If not, post your settings so we can take a look at how you've configured Dolphin.
EDIT: Nvm, just saw that you are using the latest rev (your profile said otherwise). It's probably something in your settings then. Post them as text or a screenshot.
EDIT: Nvm, just saw that you are using the latest rev (your profile said otherwise). It's probably something in your settings then. Post them as text or a screenshot.