This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I have followed all steps in creating MD5 certificate, Map API key etc. I also signed my app and everything worked fine yesterday on my Mobile device. I was able to see Map with no issue in my application etc. Today all of a sudden it stopped displaying Map but just gray grid. Any idea?