Edit: I learned that my error was unrelated to the robots file. Disregard.
I just learned the hard way that Google blocks access to the Maps API if you have a restrictive robots.txt file. I recently created a robots file with "Dissallow: /". Now my site can no longer use Maps. Rats.
I removed the robots file, but I still cannot use Maps. I also tried creating a completely permissive file ("Dissallow: "), and that has not yet solved the issue.
Can anyone tell me the next step? If at all possible, I'd prefer the site not show up in Google, since it's a staging site. But I also don't know how long before they rescan for a new robots file.