On the Motorola Bravo, at the left bottom of a MapView, there is an ugly orange square rather than the google logo. I notice this not only on my app, but on say, Yelp -- se
Here is what i found out, hope it helps at least a bit.
I have a Motorola Milestone (it is the EU version of the Droid as you probably know) with vodafone branded rom (so no ported custom rom) and do not have this 'bug' at all. Here are some screens of Google Maps and Yelp...
so I do not have this problem at all but that does not mean other Milestone users do not have it. Maybe it is because of a missing image in one of the operators firmware files - when they customize their roms, they may delete some google-specific images and then forget to replace them with their own images (or put an ugly orange png at this place).
So I'm afraid I can't help any further, but at least i could show that this is not necessarily a motorola problem but maybe a provider problem?!
you could have written that you already posted this to motorola developers forum so i would have saved the time to look at this resource ;) click
edit: i found a post at modaco forum where a user describes the orange square as a bug in a custom rom --> the post. this is on acer liquid.