MapMyfail.

11°C, light NW..slight snow.
MapMyRide failed yesterday. The app refused to communicate with the GPS sensor. Other GPS apps worked as expected, but not MapMyRide. Strange because there were no updates that could be a simple explanation. Other software updates?

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Eventually, I decided to uninstall the app and replace it. However, using the app manager, I noticed the Clear Data button, so tried that.
After logging in again, success!