This is what I learned, I hope that this helps at least a little.
I have a Motorola Milestone (this is a version of the Droid, as you probably know in Europe) with the proprietary vodafone plugin (so a ported custom rum) and does not have this “error” at all. Here are some screens of Google Maps and Yelp ...


therefore, I do not have this problem at all, but that does not mean that other Milestone users do not have it. Perhaps this is due to a missing image in one of the operators' firmware files - when they set up their roms, they can delete some images that depend on Google, and then forget to replace them with their own images (or put an ugly orange png in this place).
So, I'm afraid that I can no longer help, but at least I could show that this is not necessarily a problem with Motorola, but maybe a problem with the provider ?!
You could write that you have already posted this on the Motorola Developer Forum, so I would have saved time to look at this resource;) click
edit: I found a post on the modaco forum where the user describes the orange square as an error in the custom rum -> message . it's on a liquid acer.
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