I was playing on a single player modded survival and I went to check the forums for help with one mod. When I got back on my game I couldn't mine or place blocks and I've tried switching to /gamemode 0 but this only happened in my modded survival. I can still place and break blocks in vanilla Minecraft.
2 Answers
Not being able to do that means you're in adventure mode. Remember that now you can use /gamemode a, s, or c to change your gamemode to avoid things like this happening again.
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Or /gamemode 0 for survival, 1 for creative, 2 for adventure, and 3 for spectator. Far more intuitive for me.– user119567Feb 17, 2016 at 4:52