Hiya,
To get the mac fix I migrated to 2.8. Ever since the command Display.setFullscreen(true); doesn't make the applet go to fullscreen anymore in Windows 7 (tested both nvidia and ati). I'll try to figure out how to use the debug jar and see if some kind of output is created.
Mike
EDIT: using the lwjgl-debug isn't possible as it complains about opengles not being available (java.lang.NoClassDefFoundError: org/lwjgl/opengles/PixelFormat and it is indeed missing in the jar but I'm not using opengles). Using -Dorg.lwjgl.util.Debug=true doesn't give any extra output.
EDIT2: Apparently System.out.println(Display.getDisplayMode().isFullscreenCapable()); returns false which is why it isn't switching anymore. This is where I got stuck looking through the code, I don't know what changed that could have caused it.