About two months back, I was tinkering with the Salesforce1 warehouse tutorial ( Salesforce1 Mobile Workbook. It's the one where you show the location of your warehouses (Salesforce data) on a Google map. This was working for me, but now shows a blank page. To the best of my knowledge, I haven't changed anything in the code. In fact, the error is coming from inside a static resource. FWIW, my sandbox is on cs13.
The error I get now is:
https://maps.gstatic.com/intl/en_us/mapfiles/api-3/14/1/main.js - 404 Not Found
I think the solution is hinted at in the FindNearby Visualforce page here:
Can someone confirm that getting a Google Map Api key will fix this problem for me?