Boot Camp Assistant crashes when partitioning drive (exception: EXC_BAD_ACCESS)

I run Mountain Lion, a fresh install, brand new Macbook Pro. HD: Samsung 840 Pro 512 GB SSD.

When trying to go through Boot Camp Assistant / Setup it works fine until it wants to repartition my drive. It then quits unexpectedly and returns these errors:

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000000000003c

Everything else on this new machine works like a charm. I checked permissions, verified the disk - no issues whatsoever.

I tried running the Assistant as root - it also crashes when partitioning but then in the Terminal i get a

Segmentation fault: 11

Can anyone help me out with this?

Run Repair Disk on your boot partition. To accomplish this, reboot your Mac into the recovery partition, holding down ⌘R when you see the Apple logo. Select Disk Utility from the menu, then in the First Aid tab click Repair Disk. This may take some time. Partitioning trouble is usually a file system or disk hardware problem; this will solve the former, and a trip to the Apple store is usually needed to address the latter.

For me it crashed when accessing the USB drive. I reformatted my USB as Mac OS extended via Disk Utility and was able to continue after that.