I see these errors in the console. Say there is not enougth space when clearly there is (300gb free)
9/18/13 10:25:01.000 PM kernel: hfs_truncatefs: insufficient space (need 200578798 blocks; have 98252775 free blocks)
9/18/13 10:25:01.256 PM Boot Camp Assistant: NSAlert is being used from a background thread, which is not safe. This is probably going to crash sometimes. Break on void _NSAlertWarnUnsafeBackgroundThreadUsage() to debug. This will be logged only once. This may break in the future.