Ryan Alexander pointed out that the latest glgraphics release was compiled with JDK 1.6, which creates compatibility problems if you are using Java 1.5 on your machine. This is a good point, so I recompiled the library using the JDK 1.5 instead. Based on Ryan’s suggestions, I also added support for flipped textures in the GLTextureWindow class. The new release of glgraphics (0.9.1.1) incorporating these changes is here.