Very new to mapping and the mapping community. I was trying to test an extremely simple map, but when TF2 loaded up, it crashed soon after. I check the compile log and the error in the log was apparently that the map doesn't have a valid skybox, which doesn't make any sense because I was able to run another test map without a proper skybox before. Then I go to click "Check for problems." The only problem it found was that "There is no player start." This also confused me because I had about 14 spawn positions (per team) already placed. Restarting Hammer also didn't work. Also, during the short time frame that the gay WAS running, a few weird things were going on with the main screen. Specifically, the icons for each button, the Team Fortress 2 splash title, and Mrs. Pauling were all missing or replaced with wire frame boxes with diagonal lines through them. What does all this mean? Are any of the errors I mentioned the problem, or am I missing something? Probably made a nooby mistake of some sort, but I'm not sure. Please help!