OpenSolaris Upgrade to 100a damages the whole system

Today I upgraded to the Build 100a of OpenSolaris with the IPS system. After reboot the system boots
up, but no GUI or command line login appear's.
After power off and reboot to Build 99 the system starts booting but reboots immediatly so the old
version is also not bootable.

The CD with Build 98 boots, but can not import the ZFS pool, because it was opened with an other system.

For now I download the CD of Build 100a and wil lthan try to boot from this CD.