Geocoder scheduled job incorrect API parameters

Using the Scheduled Geocaode address job there is the option to enter the following parameters.
Parameters raw (from db settings):
geocoding=[1 or 0] required
parse=[1 or 0] required
start=1
end=10
throttle=[1 or 0] optional-1 adds five second sleep

If you specify a start or end param, which should be a contactID, you get an error stating:
Finished execution of Geocode and Parse Addresses with result: Failure, Error message: start is not a valid date: 123

This worked fine in 4.5.8 but has stopped working in version 4.6.