Windows 7 x64
**Short description of error**
When activating "World Background" in the display option of the viewport, if sky is chosen as world environment, a pure white is displayed. HDR works good.
**Exact steps for others to reproduce the error**
# Default Scene, switch to Cycles,
# choose "Sky Texture" as world environment,
# activate "World Background" in the display option of the viewport
If the exact same sky can't be displayed, at least a blue gradient or a baked version of the sky would be nice, pure white really hurts the eye and makes readability bad.