But wouldn't that affect all game play graphics and not just the title screen?
Not necessarily. For example, the GROM characters (text) in that image all look fine. You can often use stock GROM for quite a few game elements.
If the memory has only certain bad locations, and only certain games put graphics characters at those locations, you could see stuff like this. If it seems to work fine after resetting or "warming up" then it could be certain physical connections are bad, and after heating up, the physical connection is restored due to thermal expansion.
For example, it could be that one 'bit 4' in the GRAM chip's connections to the rest of the bus is bad.
his comment stating "Plays/displays ALL the other recent brews just fine" would/should mean that it isn't a bad trace since this isn't globally affected to all games.
Could be bad GRAM/RAM stuff if these two particular games are using addresses in a bad area, while other games don't use those, but someone more adept in programming can stipulate accordingly.
Yeah. Those really adept at this can just look at a garbled graphic and have a good idea about which specific bit(s) may be bad. If it's for particular games only, then it's more likely internal to the GRAM chip than on the bus, though.
EDIT: I just realized that your initial response was specifically to the 'cracked trace' guess. So yeah. What you said.