Reboot loop from Boot to Netboot task

We recently upgraded to Altiris 7.6 HF5 and after upgrading our OSX NetBoot image, I'm running into problems when attempting to execute the Boot to Netboot task. 

The client will succeed in booting to the correct NetBoot environment, but will then proceed to pickup the "Boot to NetBoot" task again. This will get it caught in a loop. 

Anybody else running into this? Adjusting the registration time doesn't appear to make a difference.