When I was playing Gmod, I stepped on a default texture and it sounded as a metal texture. This happens to all default textures including default texture props. Here's some pics:
(http://img43.imageshack.us/img43/1971/gmsuperstruct0000.jpg)(http://img831.imageshack.us/img831/7640/gmflatgrassstorm0002.jpg)(http://img192.imageshack.us/img192/1197/gmsuperstruct0001.jpg)
Any ideas how to fix this?