Google Authenticator

I had no problem using Authenticator for the first month. Two weeks ago, my phone's operating system upgraded and now Authenticator will not work. I have uninstalled it, re-downloaded it, and reinstalled. No matter what function I choose (sync time, setup) I get an error message that Authenticator has stopped working. Also, since I need the two-factoring for our website, that the codes stopped working on that. I keep reporting the issue to Google but of course have had no response. Any suggestions?