Unable to receive messages after upgrading to version 9, but can still send messages

Just upgraded to version 9, cannot receive messages but can still send (checked on my wife’s account).
I was previously using version 8. I tried uninstalling version 9 and re-installing version 8, but got a problem with the database due to it being version 9 and not compatible with version 8.
Any suggestions would be welcome as I need to receive messages urgently!!