The person this morning was in the ProSeries Facebook group, this is what he posted when he finally got it working

"Did the ole reboot and about seven attempts and now seems to be working. The original issue was the app would close out upon sign in."

Sounds like youve done all that though, I can give you instructions for a clean reinstall.

https://proconnect.intuit.com/community/multi-user-mode/help/uninstall-rename-and-reinstall-proserie...