Re: 173.14.30 Fix needed pronto
There's no evidence in that Launchpad bug that they tried 173.14.28. Given that it doesn't support the X server Ubuntu 11.04 uses, how did you test it to determine that it worked?
A "GLSL rendering pathway" would be a set of code routines in Unity that it uses when it decides the hardware is capable enough. It should make that decision ideally based on the OpenGL version and extension string reported by the driver. The only thing that changed between 173.14.28 and 173.14.30 as far as the OpenGL capabilities go is the version number. It's possible that Unity is looking at that and was confused by the change.