One last problem.

Well, I am having yet ANOTHER problem with hammer.
I do not know what I pressed but now everything I select looks like this:

I want the red tint back, because I am using dark textures & I can not see most of the things I select.

PS: I cannot use the Vertex tool either.

Open the texture editor, and press the “mask” button. The red mask will come back.

No, that did not fix it…
Thanks though.