Instructions for accessing the installation log are here: Installation Troubleshooting - PC-BSD Wiki. Please send the log to the testing mailing list (http://lists.pcbsd.org/mailman/listinfo/testing) and/or pop into #pcbsd on Freenode to discuss.
Some users were experiencing problems with GPT so we changed the default back to MBR for 9.0. We've had other users successfully dual-boot on two separate drives and have a mailing list thread started by roelof:
Is it possible for...