The new Google Maps has some pretty cool features built-in, but on some machines it can cause some graphical glitches. Thankfully, its hidden "Lite Mode" can solve these problems.
For some reason, I get serious graphical problems on my MacBook Air using Firefox -- when I try to move the map, everything turns black and takes a long time to reload. Switching to Lite Mode removes some of the 3D features, but can fix these problems if you're having them.
To switch to Lite Mode, just click here. To switch back to full 3D mode, click here. Google's help pages claim that there's a link to Lite Mode in the Maps interface, but I've yet to find it -- so hopefully this tip helps.
Lite Mode [Google Maps Help]