Which games are you talking about? If the games were PS2 Classics, then those only work in 480p mode because they are still running the original PS2 game engines in emulation, and the PS2 didn't support HD (well, actually it could display in 1080i; but it didn't know that). PS1 Classics get up-scaled to HD, but PS2 Classics do not.
The games are Tiger Woods Masters and NFS The Run. They both played in 1080p until about a week ago. I haven't made any changes to the tv. Seems like she's gettin old and this is just the beginning.