While in game, select a different texture pack or resolution from the options menu and click Apply. Observe the block texture change to the new selection after a brief loading event.- use default texture pack res 256
Select the original texture pack/resolution and apply; observe no loading event and no change in textures.- switch to 64 res
- switch back to 256 res
You can't switch back to 256 res, keeps using the 64 res pack. You can however switch to 128 res or a different texture pack since you haven't loaded those in yet.