SO I'm sure a few of you know already that valve decided to put your game folders into the blend-o-matic again.
Apparently they moved everything from under your login name to a more structured layout with everything in the Common folder.
Here's the fix for the SDK.
1) Launch the SDK
2) Edit the game configuration for whichever game you choose 3)Click through whatever warnings they send at you 4)Choose your game again and click edit 5)You have to now find where the gameinfo.txt file is located. Navigate to the Common folder in your steamapps folder. If you're running any version of HL2, it will be in that same directory. As an example, HL2:Ep2 is located here:
C:/Program Files (x86)/Steam/steamapps/common/Half-Life 2/ep2 Also the buttons are broken (for me) so just follow the highlights.