This question already has an answer here:
Here's an image of what's happening:
I can't change any of the things. Restarting Blender does nothing. This has never happened to me before and I'm unsure to why this is happening now. I saw other people with this problem but they just said that restarting would help but it didn't.
Anyone experienced this problem before or knows how to fix it?
Thanks in advance.
Also tried re-installing which didn't help. Tried deleting all addons which also didn't help. Also found out that when I try move something to another layer I can't use the numbers on my keyboard which is another thing which randomly changed recently.
Turns out there was an answer. Just had to search other terms into google. If anyone else is having the problem then go User Preferences, Editing and then enable global undo. Don't remember disabling it but I must of at some point. Here's the question where I found the answer. Sorry for wasting anyone's time if they were writing an answer :/