I hope someone can help me out with this one and I hope I'm not the only one whom has been effected. After a couple weeks of hell at work I was finally able to get back to mapping today. When I booted up hammer, there was a small update sequence that said copying files and then hammer came up. I loaded the last vmf I was working on and everything loaded fine except the 3d view was black and not rendering. Since then I have done everything in my power to figure out what the bloody problem is. Here is what I have done thus far:

Updated my graphics driver and direct x to the latest versions, reloaded hammer and tested various map files. All other rendering applications are uneffected. What is strange is that when I load a map file in hammer there are new graphics that show you the different loading steps. This was not there a couple weeks ago. I am able to get some of the sdk sample maps to render in the 3d portion but not all of them. It seems to be only the more completed levels are rendering. None of my custom maps will render and I can not get any created material in a new map to render either. Is there some new setting I don't know about?