Mirror Modifier not working?

Hello everyone. :). I have a problem. My mirror modifier isn’t working at all, which is very odd since it was a couple of days ago.

A few days ago, I managed to model a cartoony alien using the mirror modifier. I thought I’d make a new alien today, this one I’d use in my game in Unity3d, but to my horror, I can’t even manage to mirror half a cube! I select my cube, go to the wrench, click Add Modifier, then Click Mirror, and nothing happens! I checked and it’s mirroring along the correct axis. Do I need to click Apply for it to work?

Check the mirror axis. If you just add a mirror modifier to the default cube you won’t see any apparent difference as the mirrored version is sitting directly on top of the original object.
If you move your object in EDIT MODE, do you see anything change.

Do I need to click Apply for it to work?
No, that’s the whole point of having a non destructive modifier

Upload your blend file to http://www.pasteall.org/blend/ and tell us the download link

Also, if you want to change origin point of mesh (mirror axis), you can press Ctrl+Alt+Shift+C for Set Origin.

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