I'm booting up TS2 as I usually tend to do, and when I get to my neighborhood, this is what it looks like:



I get this "mesh" overlaying everything in any neighborhood or house that I visit.  The main menu and loading screens are fine.  The needs/wants panel ingame is unaffected.  And the mesh doesn't seem to affect the actual gameplay, it just looks messed up.

For reference, I'm running OS X 10.4.11 on a Powerbook G4.  This has never happened to me before.  I did not try restarting my computer or turning custom content off; I can't see what that would do, but then again I'm kind of an idiot about these things.

Any help would be appreciated, and I'm willing to answer any questions you might have.  Thanks!