SCCM 2012 SP1 with the client setting "Suspend BitLocker PIN enrty on restart" problem is after suspending the PIN entry and the system is retarted by SCCM the bitlocker PIN protector is resumed followed by another reboot. From the rebootcoordinator.log
Reboot initiated RebootCoordinator 10/1/2014 10:12:00 AM 844 (0x034C)
Retry resuming bit-locker TPM PIN protector. Retry count 1 RebootCoordinator 10/1/2014 10:16:55 AM 4588 (0x11EC)
Attempting to resume TPM PIN protector. RebootCoordinator 10/1/2014 10:16:55 AM 4588 (0x11EC)
Resumed bit-locker protectors on system volume RebootCoordinator 10/1/2014 10:16:58 AM 4588 (0x11EC)
Retry resuming bit-locker TPM PIN protector. Retry count 1 RebootCoordinator 10/1/2014 10:21:08 AM 1108 (0x0454)
Didn't suspended bit-locker. Do nothing and return. RebootCoordinator 10/1/2014 10:21:08 AM 1108 (0x0454)
Entered ScheduleRebootImpl - requested from 'UpdatesDeploymentAgent'. Rebootby = 0. RebootCoordinator 10/1/2014 10:21:09 AM 4728 (0x1278)
Scheduled non mandatory reboot from agent UpdatesDeploymentAgent RebootCoordinator 10/1/2014 10:21:09 AM 4728 (0x1278)
Raising client SDK event for class NULL, instance NULL, actionType 3l, value NULL, user NULL, session 4294967295l, level 0l, verbosity 30l RebootCoordinator 10/1/2014 10:21:09 AM 4728 (0x1278)
So when you log on the prompt for restart ballon starts showing up
Thanks.