My Selection tool in Hammer isn't working right

I can click on something but it won’t select the right thing, it’ll usually select something far away and when i hold down the left mouse button, it cycles through them all. It never did this until today. Help???

Getting similar issue, along with some issues on item dragging.

Tools>options>3d view

Make sure reverse selection isn’t checked.

As for killer, make sure the blue dotted box icon isn’t on, on the tool bar. I think its quick select or something.

it´s not on.

It´s been messing up since the SDK update where OB-source was splitted to 2007 and 2009.
Even reinstalled the SDK and entire OS.

That fixed it. Thanks.