I've gone into Amplified survival, and I tried to mine some blocks. I wasn't getting anything, so I thought it was just block lag. But I waited 5-10 mins every time, still nothing happened. Now it's been like 15 minutes and still no blocks appear.
I'm 100% sure Im in the right gamemode, too. Am I doing something wrong?
As caucow said, first make sure that you do /gamerule doTileDrops true. After you do that, and it still doesn't work, make sure that you are using the correct tool to break the block :P. If that doesn't work, try and re-install Minecraft (I know it seems kinda lame, but hey, it works (sometimes)). If it still doesn't work, ask these people.
/gamerule doTileDrops? It is very similar to its sister gameruledoMobLootbut instead of controlling mob drops, it controls whether or not blocks drop items when destroyed in any way. Executing/gamerule doTileDrops truewill set the gamerule back to its original state. If this works for you, comment on this and I will post it as an answer. – caucow Jul 25 '15 at 20:18