I have the problem, but only on Google Maps, and only in Firefox, believe it or not. Plus I'm on an Apple, using OSX Mavericks. No issue with Safari. On this forum and everywhere else I've looked on global searches, looks like about 95% of those having this problem are using Chrome on a PC...?
Initially when first arriving to the page, the map is clean, normal. But once I try to slide it with the mouse button using the cursor to slide the map, it goes either mostly, or completely black. Sometimes remaining that way, and sometimes returning partly, or even totally back to normal. Every inch of the map, apart from the controls, is affected. Same by using the slider to navigate viewing distance of the ground from above.