Can't spawn in items

[GHouseSwag]

I don't know what I did, but I was playing tekkit the other day, and I did something that made it so that whenever I open my inventory, instead of having the option to make it creative, change the time, and the list of every item is all gone, so now it is just my inventory. How do I fix this? Also, whenever i try to play tekkit, it "builds world" halfway, does nothing for 45 seconds or so, then I spawn into the wolrd, but I can only see my hotbar, the rest is black, and I can't move or close the window or anything, I have to ctrl-alt-delete and end the program. Help is appreciated

[Torezu]

Push 'O'. Oh, and post a bug report for the other thing.