I am experiencing similar but a bit different results.
I cannot log into into AC with finder on 8080 LAN, it wont even try
I can log into AC with finder on 80 LAN I get the XML Parse errors.
I can log into 8443 LAN with no parse errors.
I have rebooted numerous times.
Other than that, the install went beautifully.
Thanks UDI team!
-Tim