3DS max Vertex Moving problem

[DrKoala]

So, as the title says, I got a problem. A big one.
While working on a model in 3DS max, I must've accidently clicked on something, and now I can't move vertices as it is normally done - simply selecting the vertices, and then moving them via the X, Y and Z arrows.
I need to know just what the hell I did there, and how exactly I can restore this to they way it was.
In case it helps, here is a screenshot of my current situation.

http://img832.imageshack.us/img832/3456/asdfdsa.png

[LookItsLink]

Press spacebar. >.>
No joke. Try it. <.<

[DrKoala]

I did it, it didn't work.

[LookItsLink]

http://www.articlesbase.com/e-learning-articles/101-things-you-didnt-know-in-3ds-max-in-fact-it039s-104-things-1854162.html
There might be something here that can help.

[DrKoala]

I haven't really found anything... >_>
I'll just try through it, and see if I can find anything <_<

But seriously, doesn't anybody know what these red arrows have to mean, and how I can back to the usual ones? >.<

Edit:
I did, I was able to reset all settings. Now I can get back to work again...

[Segab]

next time, press X.

bonus:
if your model disappears when you rotate or move around the screen, press O.