Why doesn’t the local map show roads

I seem to be having an issue with my local map in Kingdoms of Amalur: Reckoning.

As you can see, it shows the proper icons, but it doesn't show the actual roads. This makes planning my route to my next quest objective (or even finding my way) extremely difficult.

I did notice, however, that whenever I first entered an area (specifically a cave), I was met with this map:

Well, wait a minute. What's this? Everything is shown. But, whenever I proceed further into said cave:

Aww… Nuts. (╯°□°）╯︵ ┻━┻

How can I fix this map?

EDIT
It seems to work just fine upon leaving an area (such as the cave in the pictures above). Once I reach a certain distance from the cave entrance, however, it returns to the black background with various icons shown.