IMac with 3TB Fusion drive will not partition under Boot Camp

I have a 27" iMac with a 3TB Fusion drive and I am using 10.8.4.
I am trying to install Windows 8 Pro with Boot Camp.  Everything starts well enough, but once I get to "Create a Partition for Windows" and setting a 505 GB Windows partition, it begins the process, but then seems to stop progressing with the status indicator pretty much stopped at a point directly under the "d" in the "Status: Partitioning disk.."
I've let it run for the past 1.5 hours and it hasn't budged.
This is not my first attempt at doing this on this machine.  I tried manually partitioning with Disk Utility which pretty much ended up in a disaster that I was able to repair with some difficulty.  That was covered in this thread.
I realize that 3TB drives were not supported under 10.8.3, but I thought that was fixed.  Am I wrong? 

This is a bit of a guess and you might have do a bit of further reading to understand what I am trying to say but basically:
When you buy a Mac - its Hard Disks come partitioned using the GPT partitioning scheme that is used for the UEFI boot process (All new Windows 8 badged computers have UEFI now as well - Macs have been using it for years). This is opposed to the old MBR partitioning scheme that was used with the BIOS boot process.
There are quite a few limitations of the MBR partitioning scheme including:
1. A limit of 4 partitions per volume
2. A limit of 2 TB per partition
3. Poor support for AHCI
When you run Boot Camp - it turns your partitioning into a hybrid of the two, so you get stuck with all the limitations of MBR - with the second bullet point above I suspect of giving you issues.
You have a couple of possible solutions:
1. Test with having all partitions less than 2 TB
or
2. (Technical) Try and install Windows 8 in EFI mode - its a bit tricky at the moment and a little bit of work - but I have it working on my MacBook Pro (although I do have nVidia graphics driver issues that you may or may not encounter as well). See my wiki at multiboot.info for links if you want to attempt this

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    CoreStorage logical volume groups (1 found)
    |
    +-- Logical Volume Group CB783377-EA29-4751-B149-FE6B210648B5
        =========================================================
        Name:         Internal Drive
        Status:       Online
        Size:         1066587906048 B (1.1 TB)
        Free Space:   12288 B (12.3 KB)
        |
        +-< Physical Volume 0221F6E1-8EE1-453A-A0EB-B32348EB6E53
        |   ----------------------------------------------------
        |   Index:    0
        |   Disk:     disk1s2
        |   Status:   Online
        |   Size:     144162512896 B (144.2 GB)
        |
        +-< Physical Volume F74A0E21-6435-4CB2-801F-95682108A391
        |   ----------------------------------------------------
        |   Index:    1
        |   Disk:     disk0s2
        |   Status:   Online
        |   Size:     120988852224 B (121.0 GB)
        |
        +-< Physical Volume C2BD0D1A-7EA2-4E36-A3EF-82A7E63BE439
        |   ----------------------------------------------------
        |   Index:    2
        |   Disk:     disk1s5
        |   Status:   Online
        |   Size:     801436540928 B (801.4 GB)
        |
        +-> Logical Volume Family 9DD06D63-96CD-4088-8F0E-061026E68C29
            Encryption Status:       Unlocked
            Encryption Type:         None
            Conversion Status:       NoConversion
            Conversion Direction:    -none-
            Has Encrypted Extents:   No
            Fully Secure:            No
            Passphrase Required:     No
            |
            +-> Logical Volume A531CC02-E337-473E-8F1F-F462595E1354
                Disk:                  disk3
                Status:                Online
                Size (Total):          1060804022272 B (1.1 TB)
                Conversion Progress:   -none-
                Revertible:            No
                LV Name:               Macintosh HD
                Volume Name:           Macintosh HD
                Content Hint:          Apple_HFS

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