MuseScore functions turn white

Example attached: When I go into Edit General Style and choose a submenu other than Score, the window will turn white. I then have to go over it to try revealing the options. If I click somewhere other than MuseScore, it will appear in full (until I choose another submenu).

Also happens to things such as the palette when something is chosen.

Using MuseScore 2.0 nightly build (4145) - Mac 10.4.11.