Blender font window often isn't rendered at all.
In wireframe mode, main window has incorrect colors.
Use the blacksmith blenchmark (from www.blender.nl) to see this.
The driver is ignoring the GL scissor, which is what's causing things to appear and then quickly disappear again. Working on fix now, this was part of the work I backed out to create the branch.
Latest trunk code renders fine with blender.