Hammer 3D View MouseDown Crash

This may be caused by using the Direct3D debug version of the dynamic-link libraries (DLLs).

Go to the Windows Control Panel, double-click the DirectX icon, select the Direct3D tab at the top of the panel, click "Use Retail Version of Direct3D", click the Apply button and exit.

Note:This may affect debugging of other DirectX applications when using MS Visual Studio (or other debugging platforms).