This jumps out. 2012-05-23T10:10:38.728-04:00 [08956 info 'TaskDataProvider'] Fetching job spec for converter.task.Task:task-10
2012-05-23T10:10:38.743-04:00 [08956 error 'ExtraInfoReader'] Key was not found: TimeZoneList.
Do the following:
Customization of guest operating systems that run Windows Vista or later might fail with certain system time zones
Conversion or reconfiguration tasks might fail during guest operating system customization if you set non-standard time zone for destination guest operating systems that run Windows Vista, Windows Server 2008, or Windows 7. The following error message appears in the vCenter Converter agent log file: TaskImpl has failed with std::Exception: Timezone
.
Workaround: On the Customizations page of the relevant vCenter Converter wizard, select Time zone, and select (GMT) Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London from the Time zone drop-down menu. You can change the time zone of the destination machine manually after the conversion task completes.
This is for converter 4.2 and I see you are using 5, but it is worth a try.