[Observium] svn 5536 apache 500?

is anyone else seeing a 500 apache error and blank login after upgrade to 5536?

im not seeing anything in the logs to suggest errors, and it was working fine prior to upgrade

last entry in observium.log is just prior to upgrade

machine is ubuntu precise running observium on amazon ec2 beautifully. if I’m alone on this it must be the machine/instance

thanks in advance NT