In Alpha 26 due lack of Atlas testers we have a minor bug (doesn't affect you if you don't paint terrain in Atlas). The bug is terrain textures previews are blurried: To fix that you need to download and install the attached mod. Note: you need to put the mod before the public mod in the enabled mods list to make the fix working: a26-fix-atlas.1.pyromod Reported only after release here: