you can only break solid blocks with the same tool that breaks it the quickest
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Cannot confirm.
Can break stone by hand.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt
) here.

You're in Adventure Mode. You can change your Gamemode via "/gamemode 0" for Survival or "/gamemode 1" for Creative. This only works if you have Cheats enabled, if you don't, use "Open to Lan" and set "Allow Cheats" to "yes", then change your gamemode.