There are several complaints in the Google Places Help forums from business owners that Google Places has not shown impression data for their map listings for a month now.
The bug seems to be effecting a subset of Google Places accounts.
The first report came in about a month ago.
Vanessa from Google updated us yesterday saying it will likely not be fixed until next year. She said:
We're still having some technical trouble with this. But with the holiday, we're not going to be able to get a fix out the door until early January. Thanks for being patient and reporting more examples of this here!
Do you have this issue?
Forum discussion at Google Places Help.