Finder Freezing when creating ASR image

Hello, I have been testing out the new 1.3b version of InstaDMG and have been having a little trouble getting it to complete the ASR image. I updated the instadmg.bash script for my configurations and kick of the install as root. I open the log file so I can watch things progress and everything seems to go just fine up until it is creates the ASR output image. The ASR image gets to about 2.75gb and then all of a sudden all the apps seem to hang. I am still able to drag the windows around but I am unable to force quit an app in the dock or launch force quit using option-command-escape. I let it sit for over an hour and a half hoping it would magically start working again but no luck. During the time the system freezes I also notice that the disk activity stops on the external firewire 800 drive I am using. I have tried this from my 15" Macbook Pro and my Core 2 duo iMac and both have the same issue. I am running instaDMG on leopard 10.5.2 and creating the ASR image from a retail leopard 10.5 install DVD disk image. I am sure I am configuring something wrong but for the life of me I can't figure out what it is. I am trying it again from the iMac and this time I have closed all apps but terminal. If it happens again I can post the contents of the log file. Any suggestions? Thanks!