Hey,
Updated from 5.05 to 6.1-rc5 with no issue (did have to remove the usb stick and run make_bootable).
The only question I have is how do I enable disk shares? On 5.0.5 you would just click on the disk and be allowed to share the disk and set the security permissions for it...I don't see that in 6.1.
Edit: I had to set "Enable disk shares" from "Auto" to "Yes" for me to see the disk shares
Take Care