Please disregard the title - this is an issue with the plymouth splash, not grub.
I have upgraded from Ubuntu 9 to Ubuntu 10.04 and I have an ATI 4850 with propriety drivers installed. I have tried about every fix for this including:
and the startup manager workaround; I have been careful to set gedit to my monitor's native resolution 1440x900
Every fix has just given me varying degrees of graphical corruption and/or no splash image; I get a nice splash when shutting down. What's going on??? Help appreciated.