After checking the forum this morning to see if the problem was fixed, I checked my system but it was still broken. I was able to get it going by opening the UI, selecting Menu (upper right), the Settings, then Troubleshooting and finally Repair App. I did this on three computers. It would sometimes crash before completing and would take two or three tries to get there. Once it repaired, I opened the UI again and it asked me to restart. After the restart all seems fine.