Chuck: I think the correct command line parameter is actually --opengl=0 or --opengl=1; I don't think that true/false works correctly.
On my Ubuntu Linux 12.04 with Intel integrated graphics (using the open source driver), the terrain preview works correctly with OpenGL, but fails in software rendering mode. Both of this is after a clean start of Widelands, forcing OpenGL (or not) via the command line.
Chuck: I think the correct command line parameter is actually --opengl=0 or --opengl=1; I don't think that true/false works correctly.
On my Ubuntu Linux 12.04 with Intel integrated graphics (using the open source driver), the terrain preview works correctly with OpenGL, but fails in software rendering mode. Both of this is after a clean start of Widelands, forcing OpenGL (or not) via the command line.