Follow along with the video below to see how to install our site as a web app on your home screen.
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Do you notice if any of your other apps are having problems (even tiny problems)? This could be caused by the OTA update where some or one of the files for Google Now got corrupted. It could be all that is needed is to just wipe the data for Google Location, Maps, and Navigation.
If clearing the data does not work, you could try uninstalling all of the updates for Google Maps and then reinstalling.
A last resort would be a factory reset (if you're rooted, this is done via recovery), which would probably fix your problem. I'm pretty sure Google tech support will make this suggestion as one of the troubleshooting steps to try.