Any ideas?

Does anyone happen to know why, since I downloaded Firefox 3, I am unable to view any Google maps?  I can search for things as normal but the screen just comes up grey with the red arrow helpfully pointing out the right spot in the middle of all the greyness.  It'll even find me directions between two grey points and mark the route.  Might there be some setting that needs changing to allow the images?

ETA: On closer inspection, what happens is that after loading for a while, I get the message that Google has no images at that level and I should try zooming out.  This is clearly nonsense, but also probably not a Firefox problem.