gDEBugger, an OpenGL API debugger and profiler, traces application activity on top of the OpenGL API allowing programmers to see what is happening within the graphics system implementation. The new V1.4 supports the OpenGL 2.0 standard and many additional extensions. The latest features include stub fragment shader replacement and OpenGL light overrides. These features enable the pinpointing of application graphic performance bottlenecks caused by either fragment shaders or light-related calculations. In addition, gDEBugger contains a powerful break-on-detected error mechanism that stops execution of the debugged application when detected errors occur. The texture viewer now displays images and properties of multi-textures.