Ok I got a lead on a possible fix for this. First look in hub events for an error as shown here:
None of the basic rules apps working - they use to, but not anymore - #12 by bahree
Then look in past logs filed under "sys:" with "Hub" as the device for an error which should reveal the app / device ID number.
Then you can use an endpoint to remove the broken jobs
Apps: None of the basic rules apps working - they use to, but not anymore - #16 by bahree
Devices: None of the basic rules apps working - they use to, but not anymore - #17 by bobbyD
This is the endpoint to use and replace ### with the app/device number from the error.
http://your-hub-ip/hub/advanced/deleteAppJobs/###
http://your-hub-IP/hub/advanced/deleteDeviceJobs/###
Update: Found where they saw the app ID, it was in the normal logs, not sure what your error will look like though: None of the basic rules apps working - they use to, but not anymore - #9 by bahree
