This happens whenever I hover over the blocks and the black outline appears. It becomes normal again when I look at a mob or look away.
The square around the minimap become the color of the sky behind the cursor, and the sky colors intensify.
Voxelmap also has a square around it, but it doesn't show up in the screenshot.
I have forge #1289 for 1.8 and LiteLoader beta, my mods are:
- Optifine Ultra
- Sound Filters